diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..83db91b
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,58 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Commands
+
+```bash
+make build        # build ./bin/quartr
+make test         # go test ./...
+make install      # go install ./cmd/quartr; if QUARTR_API_KEY is in env,
+                  # also runs `quartr auth login` to persist the key
+                  # to ~/.config/quartr/config.json (mode 0600)
+make clean        # remove ./bin
+
+go test ./internal/cli -run TestBuildConfigPrecedence   # run a single test
+
+pre-commit run --all-files    # lint+test against the whole tree
+~/go/bin/golangci-lint run    # lint without pre-commit (needs v2.12+)
+```
+
+`pre-commit install` was already run in this clone — every commit runs golangci-lint (with `--fix`) and `go test ./...`. The hooks pin golangci-lint v2.12.0; CI pins the same version through `golangci/golangci-lint-action@v7`.
+
+## Architecture
+
+Three internal packages, no external deps (Go stdlib only):
+
+- **`internal/quartr`** — HTTP client and config persistence. `Client.GetBytes` retries 429/5xx with backoff (honors `Retry-After`). `LoadConfig`/`SaveConfig` handle the JSON file at `~/.config/quartr/config.json`.
+- **`internal/cli`** — command dispatch and request shaping. The whole CLI surface is driven by a single `resources` map in `resources.go` keyed by command name; each entry describes the API path templates, allowed query params (`paramSet`), and download/stream URL fields. `handlers.go` dispatches the operations (list/get/summary/pages/chapters/download/stream) against any resource by reading from that map. Adding a new resource = one map entry, no per-command handler code.
+- **`internal/output`** — formats results as `table` / `json` / `csv` / `raw`. `--fields` supports dotted paths (`event.title`) via `getPath` recursive traversal.
+
+`cmd/quartr/main.go` is a 3-line entry point that calls `cli.Run`.
+
+### Cross-cutting design choices to preserve
+
+- **Auth precedence is `flag > env > file > defaults`** — implemented in `internal/cli/config.go` `buildConfig`. Tests must `t.Setenv` to clear `QUARTR_*` env vars before asserting defaults; otherwise the user's shell env leaks in.
+- **Companies API uses `ids`, not `companyIds`** — handled by `listFlags.toParams` taking a `companyEndpoint` flag. Don't generalize this away; Quartr's API is genuinely asymmetric.
+- **`--all` auto-bumps `--limit` to 500** unless the user passed `--limit` explicitly. Detection lives in `flagWasPassed` (string-scan over the raw args, since the `flag` package can't distinguish "default" from "explicitly default").
+- **`parseInterspersed`** in `flags.go` lets users write `cmd <id> --flag value`. The stdlib `flag` package stops at the first positional, so we shuffle flags before positionals before delegating.
+- **Downloads do NOT send `x-api-key` by default** — the Quartr `fileUrl` is publicly fetchable. `--with-api-key` is the opt-in.
+
+## Lint config notes
+
+- golangci-lint v2 syntax (config has `version: "2"` at top). v1 is built with Go 1.24 and rejects this repo's Go 1.26 target — never downgrade.
+- `gomodguard` is referenced as `gomodguard_v2` after the v2.12 deprecation rename.
+- `gocritic.hugeParam` is intentionally disabled — passing `resource` (200B) by value is the design, not a perf bug.
+- `gosec G304/G602` excluded globally — file paths from CLI args and bounds-checked slice indexes are inherent to the tool.
+- `gosec G117` is suppressed via `//nolint:gosec` on the single line where it fires (`json.MarshalIndent(cfg, ...)` in `internal/quartr/config.go`) — that file IS the credential storage, by design.
+- `varnamelen` / `goconst` / `tagliatelle` / `canonicalheader` are disabled because they fire heavily on idiomatic short-scope vars, output-format string literals, Quartr's camelCase JSON tags, and Quartr's lowercase headers (`x-api-key`).
+
+## Repo / branch hygiene
+
+- Remote: `git@github.com:TJC-LP/quartr-cli.git` (private).
+- `main` is protected — push to a feature branch and open a PR with `gh pr create`. Direct pushes to `main` are rejected.
+- `.env` and `bin/` are gitignored; the `.env.example` exception is preserved.
+
+## Skill
+
+The `.claude/skills/quartr/` skill (loaded automatically by the harness when working in this repo) documents how to drive the `quartr` binary at runtime — commands, flags, recipes, and the type-id lookup tables for events and document forms (10-K = 11, etc.). Reference it instead of re-deriving CLI usage from the source.
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e1f96b6
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 TJC-LP
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/cmd/quartr/main.go b/cmd/quartr/main.go
index adfcb38..2a3bd93 100644
--- a/cmd/quartr/main.go
+++ b/cmd/quartr/main.go
@@ -1,3 +1,6 @@
+// Command quartr is a dependency-free Go CLI for the Quartr Public API v3.
+//
+// See README.md and `quartr --help` for usage.
 package main
 
 import (
diff --git a/internal/cli/app.go b/internal/cli/app.go
index 2b91871..2260f59 100644
--- a/internal/cli/app.go
+++ b/internal/cli/app.go
@@ -1,3 +1,8 @@
+// Package cli implements the quartr command-line interface: argument
+// parsing, command dispatch, request shaping, and pagination.
+//
+// All commands are driven from the resources map in resources.go. Adding
+// a new resource is a single map entry — no per-command handler code.
 package cli
 
 import (
@@ -9,6 +14,7 @@ import (
 	"quartr-cli/internal/quartr"
 )
 
+// Version is the CLI release string, surfaced via `quartr --version`.
 const Version = "0.1.0"
 
 type app struct {
@@ -27,6 +33,10 @@ func newApp(out, errOut io.Writer, cfg effectiveConfig) *app {
 	}
 }
 
+// Run is the package entry point. It parses args (without the leading
+// program name), builds the effective config from flags/env/file, and
+// dispatches the command. Returns the exit code: 0 for success, 1 for a
+// runtime error, 2 for a usage error.
 func Run(args []string, out, errOut io.Writer) int {
 	globals, commandArgs, err := extractGlobalFlags(args)
 	if err != nil {
diff --git a/internal/output/output.go b/internal/output/output.go
index 1be2331..5597b48 100644
--- a/internal/output/output.go
+++ b/internal/output/output.go
@@ -1,3 +1,6 @@
+// Package output formats CLI responses as table, json, csv, or raw.
+// Table and CSV output respect Options.Fields, including dotted paths
+// like "event.title" that traverse nested maps.
 package output
 
 import (
@@ -12,11 +15,18 @@ import (
 	"text/tabwriter"
 )
 
+// Options controls how Write renders an object.
+//
+// Format is one of "table" (default), "json", "csv", or "raw".
+// Fields is the explicit column list for table/csv output; empty means
+// auto-select preferred columns from the response.
 type Options struct {
 	Format string
 	Fields []string
 }
 
+// Write renders obj to w according to opts.Format. Returns an error for
+// unknown formats or write failures.
 func Write(w io.Writer, obj any, opts Options) error {
 	format := strings.ToLower(strings.TrimSpace(opts.Format))
 	if format == "" {
@@ -285,6 +295,9 @@ func renderValue(v any, maxLen int) string {
 	return s
 }
 
+// PrettyJSONBytes reformats raw JSON with 2-space indentation. Invalid
+// JSON is returned unchanged so callers can use it as a best-effort
+// formatter on untrusted input.
 func PrettyJSONBytes(b []byte) []byte {
 	var obj any
 	dec := json.NewDecoder(bytes.NewReader(b))
diff --git a/internal/quartr/client.go b/internal/quartr/client.go
index 36a2b4a..62f03c9 100644
--- a/internal/quartr/client.go
+++ b/internal/quartr/client.go
@@ -1,3 +1,5 @@
+// Package quartr is the HTTP client and on-disk config layer for the Quartr
+// Public API v3. It depends only on the Go standard library.
 package quartr
 
 import (
@@ -15,10 +17,14 @@ import (
 )
 
 const (
+	// DefaultBaseURL is the production API endpoint used when no override is configured.
 	DefaultBaseURL = "https://api.quartr.com/public/v3"
-	UserAgent      = "quartr-cli/0.1.0"
+	// UserAgent is sent on every outbound request.
+	UserAgent = "quartr-cli/0.1.0"
 )
 
+// Client performs authenticated GET requests against the Quartr Public API.
+// It retries 429 and 5xx responses with backoff and honors Retry-After.
 type Client struct {
 	BaseURL string
 	APIKey  string
@@ -26,6 +32,9 @@ type Client struct {
 	Debug   bool
 }
 
+// APIError is returned when the API responds with a non-2xx status.
+// The full response Body is preserved (truncated at 800 chars in Error())
+// so callers can inspect the structured error payload.
 type APIError struct {
 	StatusCode int
 	Status     string
@@ -33,6 +42,8 @@ type APIError struct {
 	Headers    http.Header
 }
 
+// Error implements the error interface, returning a one-line summary
+// suitable for printing to a terminal.
 func (e *APIError) Error() string {
 	body := strings.TrimSpace(e.Body)
 	if len(body) > 800 {
@@ -44,6 +55,8 @@ func (e *APIError) Error() string {
 	return fmt.Sprintf("quartr api error: %s: %s", e.Status, body)
 }
 
+// NewClient constructs a Client. An empty baseURL falls back to DefaultBaseURL.
+// A non-positive timeout is replaced with 30 seconds.
 func NewClient(baseURL, apiKey string, timeout time.Duration, debug bool) *Client {
 	if strings.TrimSpace(baseURL) == "" {
 		baseURL = DefaultBaseURL
@@ -59,6 +72,10 @@ func NewClient(baseURL, apiKey string, timeout time.Duration, debug bool) *Clien
 	}
 }
 
+// GetBytes performs a GET against BaseURL+path with params as the query
+// string. The API key is sent in the x-api-key header. Retries on 429 and
+// 5xx with exponential backoff (250ms, 500ms) and Retry-After honoring.
+// Returns the raw body, response headers, and any error.
 func (c *Client) GetBytes(ctx context.Context, path string, params url.Values) ([]byte, http.Header, error) {
 	if c.APIKey == "" {
 		return nil, nil, errors.New("missing API key; set QUARTR_API_KEY or run `quartr auth login --api-key ...`")
@@ -156,6 +173,9 @@ func sleep(ctx context.Context, d time.Duration) error {
 	}
 }
 
+// GetJSON wraps GetBytes and decodes the response into a generic
+// map[string]any. Numbers are preserved as json.Number to avoid float
+// coercion of int64-shaped IDs.
 func (c *Client) GetJSON(ctx context.Context, path string, params url.Values) (map[string]any, http.Header, error) {
 	body, hdr, err := c.GetBytes(ctx, path, params)
 	if err != nil {
@@ -170,6 +190,9 @@ func (c *Client) GetJSON(ctx context.Context, path string, params url.Values) (m
 	return out, hdr, nil
 }
 
+// BuildURL composes the request URL from BaseURL + path + params. If path
+// is itself a fully qualified URL it is used verbatim, allowing callers to
+// pass redirect targets returned by the API.
 func (c *Client) BuildURL(path string, params url.Values) (string, error) {
 	path = strings.TrimSpace(path)
 	if path == "" {
@@ -201,6 +224,9 @@ func (c *Client) BuildURL(path string, params url.Values) (string, error) {
 	return u.String(), nil
 }
 
+// Download fetches rawURL and streams the body to w. apiKey is sent in the
+// x-api-key header only when non-empty; most Quartr file URLs are public,
+// so callers typically pass "".
 func (c *Client) Download(ctx context.Context, rawURL, apiKey string, w io.Writer) (http.Header, error) {
 	if strings.TrimSpace(rawURL) == "" {
 		return nil, errors.New("empty download url")
diff --git a/internal/quartr/config.go b/internal/quartr/config.go
index f92c7c6..3fb65fc 100644
--- a/internal/quartr/config.go
+++ b/internal/quartr/config.go
@@ -11,6 +11,9 @@ import (
 	"time"
 )
 
+// Config is the on-disk shape of the persistent CLI config file.
+// Empty fields are omitted from the serialized JSON so partial updates
+// don't clobber values written by earlier `auth login` runs.
 type Config struct {
 	APIKey  string `json:"api_key,omitempty"`
 	BaseURL string `json:"base_url,omitempty"`
@@ -18,6 +21,9 @@ type Config struct {
 	Timeout string `json:"timeout,omitempty"`
 }
 
+// DefaultConfigPath returns the platform-appropriate config file path.
+// QUARTR_CONFIG overrides; otherwise uses %APPDATA% on Windows,
+// $XDG_CONFIG_HOME if set, or $HOME/.config/quartr/config.json.
 func DefaultConfigPath() string {
 	if p := os.Getenv("QUARTR_CONFIG"); strings.TrimSpace(p) != "" {
 		return p
@@ -37,6 +43,8 @@ func DefaultConfigPath() string {
 	return filepath.Join(home, ".config", "quartr", "config.json")
 }
 
+// LoadConfig reads a JSON config file from path. A missing file returns
+// the zero Config without error so first-run usage works seamlessly.
 func LoadConfig(path string) (Config, error) {
 	var cfg Config
 	if path == "" {
@@ -58,6 +66,8 @@ func LoadConfig(path string) (Config, error) {
 	return cfg, nil
 }
 
+// SaveConfig writes cfg as pretty JSON to path with file mode 0600 and
+// directory mode 0700, since the file holds the API key.
 func SaveConfig(path string, cfg Config) error {
 	if path == "" {
 		path = DefaultConfigPath()
@@ -73,6 +83,8 @@ func SaveConfig(path string, cfg Config) error {
 	return os.WriteFile(path, b, 0o600)
 }
 
+// EffectiveTimeout parses timeout as a Go duration (e.g. "30s", "2m").
+// Empty or invalid input returns the 30-second default.
 func EffectiveTimeout(timeout string) time.Duration {
 	if strings.TrimSpace(timeout) == "" {
 		return 30 * time.Second
@@ -84,6 +96,9 @@ func EffectiveTimeout(timeout string) time.Duration {
 	return d
 }
 
+// MaskKey returns key with all but the first and last 4 characters replaced
+// by asterisks. Suitable for echoing the configured key back to the user
+// without disclosing it.
 func MaskKey(key string) string {
 	key = strings.TrimSpace(key)
 	if key == "" {