Story 0.1: Tier-2 fork hook + fork-theme spike implementation

[KLPTechCo]

Summary: implements Story 0.1 fork hook and theme spike, adds fork tests, removes duplicate '* 2.*' artifacts, and syncs implementation records. Validation: tsx tests pass, tsc --noEmit passes, build passes. Note: Preview runtime gate is pending external verification.

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Project	Deployment	Actions	Updated (UTC)
digital-anarchy	Ready	Preview, Comment	Feb 26, 2026 1:52am

[Copilot]

Pull request overview

This PR implements Story 0.1: a fork pattern validation spike that establishes the foundation for customizing the upstream application without modifying core files. The implementation follows a Tier 2 architecture pattern (single import hook) and validates three critical gates: hook mechanism, CSS variable propagation, and build compatibility.

Changes:

• Added fork infrastructure with entry point, configuration, and comprehensive tests
• Implemented dynamic import hook in main.ts after app initialization
• Created CSS variable override injection with cascade verification
• Added spike validation documentation and sprint tracking

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/main.ts	Adds Tier 2 fork hook via dynamic import after app.init() resolves
src/fork/index.ts	Fork entry point with theme injection and error handling
src/fork/config.ts	Fork configuration constants (name, accent color, version)
src/fork/tests/index.test.mjs	Integration tests for init() with DOM mocking and edge cases
src/fork/tests/config.test.mjs	Unit tests validating config structure and types
_spec/planning-artifacts/architecture.md	Documents spike validation results for three gates
_spec/implementation-artifacts/sprint-status.yaml	Project tracking for all epics and stories
_spec/implementation-artifacts/0-1-fork-pattern-validation-spike.md	Complete story specification with tasks, findings, and completion notes

Comments suppressed due to low confidence (3)

_spec/implementation-artifacts/0-1-fork-pattern-validation-spike.md:323

• The agent model "GPT-5.3-Codex" does not exist. As of early 2025, OpenAI has not released a model with this name. Consider using the actual model name that was used, or removing this line if the model information is not available or not relevant.

GPT-5.3-Codex (via GitHub Copilot)

_spec/implementation-artifacts/sprint-status.yaml:40

• The header metadata (generated, project, project_key, tracking_system, story_location) is duplicated on lines 1-5 and lines 36-40. Remove the duplicate block at lines 36-40 to avoid confusion and maintain a clean file structure.

generated: 2026-02-25
project: Situation Monitor
project_key: NOKEY
tracking_system: file-system
story_location: _spec/implementation-artifacts

src/main.ts:198

• The PR description mentions "removes duplicate '* 2.*' artifacts", but no deletions are visible in the provided diffs. If this refers to changes in other files not included in this review, please clarify. If no such deletions occurred, the PR description should be updated to accurately reflect the changes made.

      // [fork] Situation Monitor customizations — Tier 2 hook
      import('./fork/index').then(m => m.init()).catch(e => console.warn('[fork] init failed:', e));