0.1.0: bump repo to 0.1.1 + immutable-tag rules

FP-1012: pyproject 0.1.1 (the v0.1.0 tag stays immutable on e420fca);
CONTRIBUTING gains the release/tag rules — tags immutable, independent
repo/website versions linked by CHANGELOG + Release mapping, website
consumes only a pinned full SHA. CHANGELOG records the v0.1.0-website /
v0.1.1-repo compatibility.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: xxg1413

CHANGELOG.md

@@ -8,6 +8,10 @@ This file records notable catalog-contract and maintenance changes.
 `docs/product-and-growth-plan-0.1.0.md`; see the website `CHANGELOG.md`
 for the platform half).
 
+Release mapping (FP-1012): this repository ships **v0.1.1** on this
+release train — the earlier `v0.1.0` tag stays immutably on `e420fca`.
+Compatibility: website `v0.1.0` ↔ repository `v0.1.1`.
+
 ### Changed
 
 - FP-1012: `docs/repo-plan-0.1.0.md` renamed to `docs/repo-plan-0.1.x.md`

CONTRIBUTING.md

@@ -120,3 +120,17 @@ justify removing a resource.
 Passing automation does not replace editorial review. After merge, a website
 consumer must deliberately update its pinned catalog commit before the new data
 appears on flypython.com.
+
+## Release and tag rules
+
+- A pushed tag is **immutable**: never delete, move, or reuse it. `v0.1.0`
+  stays pointed at its original commit forever.
+- This repository and the website (`flypythoncom/flypython.com`) are
+  independent release artifacts. They may ship different version numbers in
+  the same release train; the compatibility mapping is recorded in both
+  CHANGELOGs and in the GitHub Releases (e.g. website `v0.1.0` ↔ repository
+  `v0.1.1`), each naming the exact commit SHA.
+- The website consumes this repository at a pinned full commit SHA
+  (`content-pin.json`) — never a moving branch or tag.
+- `pyproject.toml` `version` tracks the repository release; bump it in the
+  change that cuts the release.

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "flypython"
-version = "0.1.0"
+version = "0.1.1"
 description = "Community-maintained source for building reliable Python products in the AI-coding era."
 readme = "README.md"
 requires-python = ">=3.11"