Establishes strict Git Flow: main is the public release branch, all
development happens on develop and feature/* branches. This cleanup
removes dev-only artifacts that leaked onto main during pre-1.0 setup.

Removed from main (moved to/kept on develop):
- .plans/** — planning docs, specs, designs, tracker
- .claude/** — Claude Code settings and skills (internal tooling)
- MEMORY.md, FLOW.md — internal state and decision log
- CLAUDE.md — internal contributor instructions (references MEMORY/FLOW)
- tests/sdk-core/** — devflow acceptance evidence, not regression tests

Added to main:
- .gitattributes — merge=ours drivers for the paths above, so future
  develop → main release merges don't drag dev artifacts back. Requires
  local driver registration: git config merge.ours.driver true
- .gitignore — ignore .env (secrets) and .playwright-mcp/ (local tooling)

What stays on main going forward:
  src/, docs/, examples/, tests/unit/, tests/integration/,
  README.md, LICENSE, pyproject.toml, uv.lock, .gitignore, .gitattributes

Merge develop → main. First public release.

SDK: complete rewrite with create_agent() → Agent lifecycle,
Ed25519 challenge-response, typed models, RFC 7807 errors.
Testing: 99 unit + 15 acceptance, 11 CI gates.
Demos: MedAssist AI + Support Tickets, Docker images on Hub.
PyPI: pip install agentwrit (v0.3.0 live).
CI: auto-publish PyPI on tag, auto-push Docker on main.

Closes devonartis/agentwrit#31
Closes devonartis/agentwrit#33

Generated with Claude Code Harness Agent

Co-Authored-By: Claude <claude@anthropic.com>

…de fixes

Refs devonartis/agentwrit#31

Generated with Claude Code Harness Agent

Co-Authored-By: Claude <claude@anthropic.com>