feat(workflow): standardize worktree-first development flow

[djm81]

Description

Standardizes worktree-first development across this repository and aligns OpenSpec workflow instructions/tasks to avoid direct implementation on dev/main.

Fixes #267

New Features #267

Contract References: No new public API contract surfaces were introduced; this change focuses on workflow/tooling/docs and test coverage for the helper script.

Type of Change

Please check all that apply:

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🔒 Contract enforcement (adding/updating @icontract decorators)
• 🧪 Test enhancement (scenario tests, property-based tests)
• 🔧 Refactoring (code improvement without functionality change)

Contract-First Testing Evidence

Required for all changes affecting CLI commands or public APIs:

Contract Validation

• Runtime contracts added/updated (@icontract decorators on public APIs)
• Type checking enforced (@beartype decorators applied)
• CrossHair exploration completed: hatch run contract-test-exploration
• Contract violations reviewed and addressed

Test Execution

• Contract validation: hatch run contract-test-contracts ✅
• Contract exploration: hatch run contract-test-exploration ✅
• Scenario tests: hatch run contract-test-scenarios ✅
• Full test suite: hatch run contract-test-full ✅

Test Quality

• CLI commands tested with typer test client
• Edge cases covered with Hypothesis property tests
• Error handling tested with invalid inputs
• Rich console output verified manually or with snapshots

How Has This Been Tested?

Contract-First Approach: Workflow/docs and helper-script behavior validated via targeted unit tests plus repository quality gates.

Manual Testing

• Tested CLI commands manually
• Verified rich console output
• Tested with different input scenarios
• Checked error messages for clarity

Automated Testing

• Contract validation passes
• Property-based tests cover edge cases
• Scenario tests cover user workflows
• All existing tests still pass

Test Environment

• Python version: 3.11/3.12 (hatch envs)
• OS: Ubuntu (Linux)

Checklist

• My code follows the style guidelines (PEP 8, ruff format, isort)
• I have performed a self-review of my code
• I have added/updated contracts (@icontract, @beartype)
• I have added/updated docstrings (Google style)
• I have made corresponding changes to documentation
• My changes generate no new warnings (basedpyright, ruff, pylint)
• All tests pass locally
• I have added tests that prove my fix/feature works
• Any dependent changes have been merged

Quality Gates Status

• Type checking ✅ (hatch run type-check)
• Linting ✅ (hatch run lint)
• Contract validation ✅ (hatch run contract-test-contracts)
• Contract exploration ✅ (hatch run contract-test-exploration)
• Scenario tests ✅ (hatch run contract-test-scenarios)

Screenshots/Recordings (if applicable)

N/A