feat(doc-links): C# doc-comment references become MENTIONS edges

Makefile.cbm

@@ -350,6 +350,8 @@ EXTRACTION_SRCS = \
     $(CBM_DIR)/extract_channels.c \
     $(CBM_DIR)/extract_k8s.c \
     $(CBM_DIR)/extract_dbt.c \
+    $(CBM_DIR)/doclink.c \
+    $(CBM_DIR)/doclink_cs.c \
     $(CBM_DIR)/sql_values.c \
     $(CBM_DIR)/helpers.c \
     $(CBM_DIR)/result_compact.c \
@@ -454,6 +456,9 @@ PIPELINE_SRCS = \
     src/pipeline/pass_configures.c \
     src/pipeline/pass_configlink.c \
     src/pipeline/pass_doclinks.c \
+    src/pipeline/doc_links.c \
+    src/pipeline/doc_links_cs.c \
+    src/pipeline/doc_links_msbuild.c \
     src/pipeline/pass_route_nodes.c \
     src/pipeline/pass_enrichment.c \
     src/pipeline/pass_envscan.c \
@@ -681,7 +686,7 @@ TEST_DISCOVER_SRCS = \
 
 TEST_GRAPH_BUFFER_SRCS = tests/test_graph_buffer.c
 
-TEST_PIPELINE_SRCS = tests/test_registry.c tests/test_pipeline.c tests/test_importance.c tests/test_cross_repo.c tests/test_fqn.c tests/test_route_canon.c tests/test_path_alias.c tests/test_configlink.c tests/test_doclinks.c tests/test_infrascan.c tests/test_worker_pool.c tests/test_parallel.c tests/test_index_resilience.c tests/test_index_format.c tests/test_call_reference_contract.c tests/repro/repro_call_scope_usages.c tests/repro/repro_call_argument_usages.c tests/repro/repro_reference_precision.c tests/repro/repro_lexical_binding_precision.c tests/repro/repro_call_argument_matrix_a.c tests/repro/repro_call_argument_matrix_b.c tests/repro/repro_call_node_behaviors.c tests/repro/repro_language_registry.c tests/repro/repro_call_node_manifest.c tests/repro/repro_lsp_ordered_signatures.c tests/repro/repro_lsp_ordered_local.c tests/repro/repro_ts_overload_return_chains.c tests/repro/repro_harness_cleanup.c tests/repro/repro_runner_filter.c
+TEST_PIPELINE_SRCS = tests/test_registry.c tests/test_pipeline.c tests/test_importance.c tests/test_cross_repo.c tests/test_fqn.c tests/test_route_canon.c tests/test_path_alias.c tests/test_configlink.c tests/test_doclinks.c tests/test_doc_mentions.c tests/test_infrascan.c tests/test_worker_pool.c tests/test_parallel.c tests/test_index_resilience.c tests/test_index_format.c tests/test_call_reference_contract.c tests/repro/repro_call_scope_usages.c tests/repro/repro_call_argument_usages.c tests/repro/repro_reference_precision.c tests/repro/repro_lexical_binding_precision.c tests/repro/repro_call_argument_matrix_a.c tests/repro/repro_call_argument_matrix_b.c tests/repro/repro_call_node_behaviors.c tests/repro/repro_language_registry.c tests/repro/repro_call_node_manifest.c tests/repro/repro_lsp_ordered_signatures.c tests/repro/repro_lsp_ordered_local.c tests/repro/repro_ts_overload_return_chains.c tests/repro/repro_harness_cleanup.c tests/repro/repro_runner_filter.c
 
 TEST_WATCHER_SRCS = tests/test_watcher.c
 

README.md

@@ -740,7 +740,9 @@ mode. `index_status` keeps describing the published graph and its freshness.
 
 ### Edge Types
 
-`CONTAINS_PACKAGE`, `CONTAINS_FOLDER`, `CONTAINS_FILE`, `DEFINES`, `DEFINES_METHOD`, `IMPORTS`, `CALLS`, `CALL_REFERENCE`, `HTTP_CALLS`, `ASYNC_CALLS`, `IMPLEMENTS`, `HANDLES`, `USAGE`, `CONFIGURES`, `REFERENCES_FILE`, `WRITES`, `MEMBER_OF`, `TESTS`, `USES_TYPE`, `FILE_CHANGES_WITH`
+`CONTAINS_PACKAGE`, `CONTAINS_FOLDER`, `CONTAINS_FILE`, `DEFINES`, `DEFINES_METHOD`, `IMPORTS`, `CALLS`, `CALL_REFERENCE`, `HTTP_CALLS`, `ASYNC_CALLS`, `IMPLEMENTS`, `HANDLES`, `USAGE`, `CONFIGURES`, `REFERENCES_FILE`, `MENTIONS`, `WRITES`, `MEMBER_OF`, `TESTS`, `USES_TYPE`, `FILE_CHANGES_WITH`
+
+`MENTIONS` links a documented definition to the code its doc comment references (C# `<see cref>`, `<seealso cref>`, `<exception cref>`, `<inheritdoc cref>`), one edge per pair with `via`, `syntax`, `tier` (`exact` or `unique`), first `line` and `count`. A reference is bound only when it names exactly one definition under the language's own lookup rules; the rest are counted by reason in `index_status` under `doc_links` (samples with `diagnostics='full'`).
 
 ### Qualified Names
 

docs/EVALUATION_PLAN.md

@@ -311,15 +311,16 @@ SHA, and — **not just totals** — a **per-type breakdown**:
 - `node-types.json` — a histogram of **node count by label** (`Function`, `Method`, `Class`,
   `Interface`, `Type`/`Enum`/`Struct`, `Field`, `Variable`, `Route`, `Module`, `Section`, `Macro`,
   `File`, `Folder`) + total.
-- `edge-types.json` — a histogram of **edge count by type, with one entry for every one of the 32
+- `edge-types.json` — a histogram of **edge count by type, with one entry for every one of the 33
   edge types, including those that came back `0`**. The canonical set is the indexer's own
-  `ALL_EDGE_TYPES[]` (26 intra-repo types — `tests/test_lang_contract.c`): `CALLS`, `ASYNC_CALLS`,
+  `ALL_EDGE_TYPES[]` (27 intra-repo types — `tests/test_lang_contract.c`): `CALLS`, `ASYNC_CALLS`,
   `HTTP_CALLS`, `GRPC_CALLS`, `GRAPHQL_CALLS`, `TRPC_CALLS`, `DEFINES`, `DEFINES_METHOD`, `IMPLEMENTS`,
   `INHERITS`, `OVERRIDE`, `DECORATES`, `IMPORTS`, `HANDLES`, `CONFIGURES`, `DEPENDS_ON`, `USAGE`,
   `DATA_FLOWS`, `SEMANTICALLY_RELATED`, `SIMILAR_TO`, `TESTS`, `TESTS_FILE`, `INFRA_MAPS`,
-  `FILE_CHANGES_WITH`, `CONTAINS_FILE`, `CONTAINS_FOLDER` — **plus the 6 cross-repo types** from the
+  `FILE_CHANGES_WITH`, `CONTAINS_FILE`, `CONTAINS_FOLDER`, `MENTIONS` (doc comment -> referenced
+  code) — **plus the 6 cross-repo types** from the
   cross-repo pass (`CROSS_HTTP_CALLS`, `CROSS_ASYNC_CALLS`, `CROSS_GRPC_CALLS`, `CROSS_GRAPHQL_CALLS`,
-  `CROSS_TRPC_CALLS`, `CROSS_CHANNEL`) and a total. The writer **emits the full 32-type list and
+  `CROSS_TRPC_CALLS`, `CROSS_CHANNEL`) and a total. The writer **emits the full 33-type list and
   back-fills missing types with `0`** rather than recording only the types that appeared.
 
 These come straight from `query_graph` (`MATCH (n) RETURN labels(n), count(*)` and

internal/cbm/cbm.c

@@ -6,7 +6,8 @@
 #include "foundation/mem_events.h" // waste sanitizer: the bound allocators bypass every observer
 #include "foundation/log.h"        // cbm_log_warn -- extract.lsp.skipped
 #include "cbm.h"
-#include "arena.h" // CBMArena, cbm_arena_init/alloc/strdup/destroy
+#include "arena.h"   // CBMArena, cbm_arena_init/alloc/strdup/destroy
+#include "doclink.h" // cbm_doclinks_extract: doc-comment references + doc-link scope
 #include "helpers.h"
 #include "lang_specs.h"
 #include "extract_unified.h"
@@ -3405,6 +3406,10 @@ static CBMFileResult *extract_file_ex_body(const char *source, int source_len, C
 
     result->imports_count = result->imports.count;
 
+    /* Doc-comment references of the documented definitions, and the file's
+     * doc-link scope: both read the complete docstrings and the tree. */
+    cbm_doclinks_extract(&ctx);
+
     // Accumulate profiling counters
     atomic_fetch_add(&total_parse_ns, t1 - t0);
     atomic_fetch_add(&total_extract_ns, t2 - t1);

internal/cbm/cbm.h

@@ -574,6 +574,31 @@ typedef struct {
     int cap;
 } CBMFieldTypeArray;
 
+/* One reference found in a definition's complete doc comment, or in the file's
+ * own doc (doclink.h has the syntax table and the per-language parsers).
+ * Resolution happens later, per file, in the pipeline
+ * (src/pipeline/doc_links.c). */
+typedef struct {
+    const char *source_qn; // QN of the documented definition (the edge source);
+                           // for a file-level reference the file's module QN
+    const char *raw;       // the reference as written, markup entities decoded
+    uint32_t line;         // 1-based source line of the reference
+    uint32_t def_line;     // 1-based start line of the documented definition
+    uint16_t syntax;       // CBMDocLinkSyntax (doclink.h)
+    uint16_t flags;        // CBM_DOCLINK_FLAG_* (doclink.h); set by the driver
+} CBMDocLink;
+
+typedef struct {
+    CBMDocLink *items;
+    int count;
+    int cap;
+    /* Memory ran out while this file's doc-link data was extracted (a token,
+     * a reference value, a doc text or the scope blob was lost): the
+     * resolving half fails the layer instead of publishing a silently
+     * incomplete graph. */
+    bool failed;
+} CBMDocLinkArray;
+
 // Full extraction result for one file.
 typedef struct CBMFileResult {
     CBMArena arena; // owns local memory; composites may also retain child arenas below
@@ -668,6 +693,14 @@ typedef struct CBMFileResult {
      * the Rust inner docs (//!). NULL for other languages and undocumented
      * files. */
     const char *module_doc;
+
+    /* Doc-comment references of this file's definitions (doclink.h), and the
+     * file's doc-link scope: a language-tagged text blob with what OTHER
+     * files' doc-link resolution needs from this file (C#: namespaces,
+     * usings, type and member declarations). A pure function of the file's
+     * bytes; NULL for languages without a scope scanner. */
+    CBMDocLinkArray doc_links;
+    const char *doc_scope;
 } CBMFileResult;
 
 // --- Enclosing function cache ---
@@ -759,6 +792,18 @@ typedef struct {
      * POD section index. */
     void *doc_memo;
     void *doc_pod_index;
+    /* Start line of every doc text doc_run_text built, keyed by the returned
+     * pointer (doclink.c), so a definition's doc references get exact source
+     * lines. NULL until the first doc; allocated in `scratch`. */
+    void *doc_lines;
+    /* A per-file slot for the language's doc-link hooks (parse_doc and
+     * scan_scope, internal/cbm/doclink_<lang>.c): state that has to survive
+     * between the hook calls of ONE file, e.g. an index of the file's doc
+     * sections. NULL at the start of every file. What a hook stores here must
+     * be allocated in `scratch` (or `arena`), so that it ends with the file.
+     * The core never reads, interprets or frees it. It is the only place for
+     * such state: a static or thread-local cache is not. */
+    void *doclink_state;
 } CBMExtractCtx;
 
 // --- Public API ---