docs: update CLAUDE.md and README.md for post-v1 accuracy

[myzie]

Summary

• CLAUDE.md: Fix stale Path→Branch terminology throughout, add missing interfaces (SignalStore, WorkflowRegistry) to scope section, add suspend/sleep/pause to "Does" list, update activity tier descriptions (stable/contrib/httpx split), add experimental submodules (worker, postgres, sqlite), add documentation/ user guides reference, fix frozen-signature conventions (Execute()/functional options instead of removed Run()/Resume()), update WithScriptCompiler() reference
• README.md: Add documentation/ user guides to Reference section, add experimental/store/sqlite/ alongside existing worker and postgres mentions

Test plan

• Verify all referenced paths exist (documentation/, experimental/worker/, experimental/store/postgres/, experimental/store/sqlite/)
• Confirm terminology matches current codebase (Branch, not Path)
• Confirm interface names match exports (SignalStore, WorkflowRegistry, BranchMappings)

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated execution semantics documentation with clarifications on suspension handling, branching model, and concurrency patterns.
  • Expanded module layout documentation and added references to new experimental submodules.
  • Added documentation directory reference with coverage areas.
  • Generalized persistence backend guidance in production setup section.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5f8e5db2-1b9c-4eb9-b2ab-da7acabe8057

📥 Commits

Reviewing files that changed from the base of the PR and between b73b403 and 5b10a90.

📒 Files selected for processing (2)

• CLAUDE.md
• README.md

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📝 Walkthrough

Walkthrough

Documentation updates describe the library's execution semantics, module organization, and consumer interfaces. Changes include replacing "Path" terminology with "Branch," adding SignalStore and WorkflowRegistry interfaces, clarifying built-in activities, and documenting experimental submodules including SQLite support. No code changes are involved.

Changes

Cohort / File(s)	Summary
Documentation Updates CLAUDE.md, README.md	Updated library documentation to reflect execution semantics (branch terminology replacing path), expanded consumer-provided interfaces (SignalStore, WorkflowRegistry), clarified DefaultScriptCompiler usage via options, reorganized built-in activities descriptions, and documented experimental submodules (worker, postgres, sqlite backends).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 Documentation dances in the spring air,
Branches replace paths with elegant care,
New stores and workers, all labeled with care,
SQLite joins postgres in the experimental lair,
thump thump — clarity blooms everywhere!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the primary change: documentation updates to CLAUDE.md and README.md for post-v1 accuracy. It is concise, specific, and directly reflects the changeset's main purpose.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/post-v1-updates

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