fix: adds config hash label as unique seeding label

[gusfcarvalho]

The goal of this PR is to ONLY implement the extra label to evidence sent by the agent -- ONLY.

[Copilot]

Pull request overview

This PR introduces a deterministic runtime-configuration hash label (_agent_config_hash) and incorporates it into evidence label sets/UUID seeding to reduce evidence-stream collisions when multiple agents fall back to the same _agent=ccf identity.

Changes:

• Add _agent_config_hash label to both agent foundational labels and plugin evidence labels, computed as a SHA-256 hash over a normalized runtime configuration subset.
• Seed agent-run evidence UUIDs from the full foundational label set (now including _agent_config_hash).
• Seed plugin evidence UUIDs from merged labels at submission time, and add/expand unit tests plus documentation describing the new label.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
runner/result.go	Seeds evidence UUIDs from merged labels during evidence creation.
cmd/agent.go	Computes _agent_config_hash, adds it to foundational/plugin labels, and uses it for agent evidence UUID seeding.
cmd/agent_test.go	Updates label expectations and adds tests for hash stability and UUID/label behavior.
README.md	Documents the new _agent_config_hash label and rationale.
docs/configuration.md	Documents _agent_config_hash contents and its effect on evidence streams.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.