docs: add coding lab project context

[SourceSenseiTheRealOne]

Adds the sanitized child context index, stack record, and required queue/in-progress/completion ledgers so the coding-lab control plane can validate this repository as a submodule. Also updates contributor instructions and the durable roadmap.\n\nVerification:\n- bash scripts/verify.sh\n- staged blocked-path and secret-signature audit: clean

Summary by CodeRabbit

• Documentation

  • Added project context guidance covering workflow, environment, verification, and file-loading requirements.
  • Added active-work, pending-task, and completion tracking documents.
  • Documented runtime, infrastructure, integration, build, and promotion conventions.
  • Updated the roadmap to reflect completion of the project-context and task-ledger phase.

• Chores

  • Updated the required verification workflow and task-placement rules.
  • Recorded the completed foundation milestone and its supporting evidence.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f574cfe9-7e75-4fdc-a012-0be1d63d146d

📥 Commits

Reviewing files that changed from the base of the PR and between 2c6b12e and 9d97b36.

📒 Files selected for processing (2)

• context/README.md
• context/TASK_TRACKER.md

📝 Walkthrough

Walkthrough

The change adds project context specifications, task ledgers, workflow requirements, and roadmap updates. It records completed and queued tasks and replaces the verification command.

Changes

Context and task governance

Layer / File(s)	Summary
Project context specification context/README.md, context/stack.md	Defines context-file loading order, content restrictions, platform targets, data authority, delivery semantics, protocol boundaries, adapter boundaries, and verification.
Task ledger records context/IN_PROGRESS.md, context/QUEUE.md, context/TASK_TRACKER.md	Adds active, queued, and completed task records for ARCH-IDX-002 and ARCH-IDX-001.
Workflow and roadmap integration AGENTS.md, docs/roadmap.md	Requires context and ledger reconciliation, changes verification to bash scripts/verify.sh, and marks the context and ledger work complete.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding coding-lab project context documentation and tracking files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-lab-context-ledgers

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@context/README.md`:
- Around line 5-11: Update the context load-order list in README.md to include
../README.md immediately before ../docs/architecture.md and ../docs/roadmap.md,
preserving the existing ordering of all other files.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 94991836-0f2b-4efd-a308-e8e4e2eb4b2f

📥 Commits

Reviewing files that changed from the base of the PR and between f61c243 and 2c6b12e.

📒 Files selected for processing (7)

• AGENTS.md
• context/IN_PROGRESS.md
• context/QUEUE.md
• context/README.md
• context/TASK_TRACKER.md
• context/stack.md
• docs/roadmap.md

[SourceSenseiTheRealOne]

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