docs(review): Python adaptation files for clean-code, solid and code-review

The canonical Python stack has been pinned in ~/dev/.context/AGENT.md since
local-dev v0.3.1, and three skills still had Go examples with no Python
counterpart. Following the structure #18 settled on, and the existing
solid/references/go-adaptation.md precedent, each gets a reference file rather
than inline dilution of the primary doc.

The stack table itself is NOT copied into any of them — each cites AGENT.md as
its home. This repo spent today learning what a second copy of a fact costs.

Content is the part a linter cannot give you:

- clean-code: `raise X from e` as the analogue of `%w` error wrapping, dataclass
  over `dict[str, Any]`, and the two traps where the broken version reads
  tidier — mutable default arguments, and `if not amount:` for a value where
  zero is legitimate.
- solid: `Protocol` over `ABC`, defined at the consumer, which is what makes DIP
  real in Python; plus what does NOT carry over from the Go rewrite (return
  structs/accept interfaces, embedding, package-as-deployment-unit).
- code-review: a Python anti-pattern table parallel to the Go one, opening with
  the rule that a finding ruff or mypy already catches is not a review comment,
  it is a question about why the gate is not running.

Refs #20
Bump-Type: minor

skills/solid/SKILL.md

@@ -258,5 +258,6 @@ Domain types know nothing about HTTP, SQL, or external APIs.
 
 - `references/solid-principles.md` — canonical SOLID reference with TypeScript examples
 - `references/go-adaptation.md` — this workspace's Go-specific rewrite of each principle
+- `references/python-adaptation.md` — the Python rewrite: Protocol over ABC, and what does not carry over from Go
 - Load `clean-code` skill for naming and structure
 - Load `code-review` skill for detecting violations during review