Add the changelog and the contributing guide

[ahrazzle]

protean-drafts v1.0.0

The first release of the protean-drafts ingredient, projected into a standalone
repository.

What this adds

• The draft-review procedure skill.
• The renderer, the one-command pipeline, and the prose gate (single home: this
  ingredient, never protean-ops).
• The pull-request and issue draft templates.
• A gate that proves the renderer's compiled-in header defaults carry no private
  identity or path.

Plus the machine descriptor, the standalone installer, the declared gates, the
test suite, the MIT LICENSE, and the CI workflow.

Evidence register

Item	Command	Result
gate internal-names	python3 gates/protean-drafts/check-internal-names.py .	exit 0 - clean: 20 files scanned, 0 findings
gate draft-prose	python3 scripts/protean-drafts/check-prose.py skills/draft-r	exit 0 - check-prose: clean (1 file(s), 188 lines)
gate draft-renderer-defaults	python3 gates/protean-drafts/check-renderer-defaults.py .	exit 0 - clean: 2 default header value(s) checked
test suite	python3 -m unittest discover -s tests	exit 0 - Ran 11 tests in 0.388s / OK
standalone installer	bash install.sh --target <dir> --dry-run	exit 0 - result: dry-run, no files written

Every command above was run in a clean checkout of the tagged commit. Continuous
integration on this pull request is PENDING at the time of writing: this body records only what was
observed locally.

Verification notes

• The leak gate reads SHA-256 digests of private identifiers, not the identifiers
  themselves, so the gate never carries what it detects.
• The bad fixtures in tests/fixtures/ are base64 encoded for the same reason.
• install.sh --dry-run writes no file and creates no directory; the test suite
  asserts both the dry run and a real install.

What this does not do

• No merge, no visibility change, no archive, no transfer. Review and integration
  are separate steps owned by the reviewer.
• No claim is made about behaviour beyond the commands recorded above.

Posted by the build agent; the review and the merge decision are the reviewer's.

License

MIT. The committed LICENSE file is authoritative.