action: add baseline mode

[EffortlessSteven]

Summary

• add mode: baseline to the root GitHub Action
• add a baseline-report output pointing to tokmd-baseline.json
• require exactly one parsed path for baseline mode, matching the single-path CLI contract
• include the baseline file in uploaded artifacts
• preserve omitted/module/export/gate/cockpit/sensor behavior and the gate single-path guard
• document baseline mode in the README and add Action self-test coverage
• fix a small Halstead tokenizer UTF-8 panic discovered by running baseline against the repo

Validation

• cargo run -p tokmd -- baseline . --output $env:TEMP\\tokmd-baseline-action-smoke.json --force --no-progress
• cargo test -p tokmd-analysis --features halstead tokenize_handles_non_ascii_after_operator
• git diff --check
• cargo fmt-check
• cargo xtask publish-surface --json
• cargo xtask publish-surface --json --verify-publish
• cargo xtask gate --check
• cargo deny --all-features check (passed with existing duplicate/advisory warnings)

Deferred

• browser-runner cache/progress/auth-fetch
• v2 performance/cache work

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 57e5c0eb-e0c3-4517-8d10-b7a3d6c617f9

📥 Commits

Reviewing files that changed from the base of the PR and between 0cc796a and 291b449.

📒 Files selected for processing (4)

• .github/workflows/test-action.yml
• README.md
• action.yml
• crates/tokmd-analysis/src/halstead/mod.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch action-baseline-mode

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[github-actions]

Glass Cockpit

Base: origin/main
Head: HEAD

Change Surface:

• Files: 4
• Insertions: 151
• Deletions: 13

Composition:

• Code: 25.0%
• Test: 0.0%
• Docs: 25.0%
• Config: 50.0%

Contracts:

• API: Yes
• CLI: No
• Schema: No

Health: 80/100 (B)
Risk: low (20/100)

Review Plan

• .github/workflows/test-action.yml (priority: 2)
• README.md (priority: 3)
• action.yml (priority: 3)
• crates/tokmd-analysis/src/halstead/mod.rs (priority: 3)

Receipts

Full receipt data available in JSON format.

[gemini-code-assist]

Code Review

This pull request introduces a new baseline mode to the tokmd action, updating the documentation, inputs, and outputs accordingly. The implementation in action.yml now supports running tokmd baseline with a single path requirement. Additionally, the Halstead tokenization logic in crates/tokmd-analysis/src/halstead/mod.rs was improved to handle non-ASCII characters correctly by using character vectors instead of byte-indexed string slicing, supported by a new test case. I have no feedback to provide.