Dogfood Base uv support in BankBuddy

[codeforester]

Summary

• Declare BankBuddy as a uv-managed Base project with python.manager: uv.
• Route basectl test plus bankbuddy, taxbuddy, and pytest run commands through runner: uv.
• Update README, CHANGELOG, and AI context docs for the new Base/uv workflow.

Issue

Fixes #118

Validation

• env BASE_CACHE_DIR=/private/tmp/base-cache-bankbuddy-118 UV_CACHE_DIR=/private/tmp/uv-cache-bankbuddy-118 /Users/rameshhp/work/base/bin/basectl setup --manifest base_manifest.yaml
• env BASE_CACHE_DIR=/private/tmp/base-cache-bankbuddy-118 UV_CACHE_DIR=/private/tmp/uv-cache-bankbuddy-118 /Users/rameshhp/work/base/bin/basectl check bankbuddy --manifest base_manifest.yaml
• env BASE_CACHE_DIR=/private/tmp/base-cache-bankbuddy-118 UV_CACHE_DIR=/private/tmp/uv-cache-bankbuddy-118 /Users/rameshhp/work/base/bin/basectl run bankbuddy --workspace /private/tmp/bankbuddy-base-uv-workspace-118-codex --list
• env BASE_CACHE_DIR=/private/tmp/base-cache-bankbuddy-118 UV_CACHE_DIR=/private/tmp/uv-cache-bankbuddy-118 BANKBUDDY_HOME=/private/tmp/bankbuddy-base-uv-smoke BANKBUDDY_ENV=dev /Users/rameshhp/work/base/bin/basectl run bankbuddy bankbuddy --workspace /private/tmp/bankbuddy-base-uv-workspace-118-codex -- status
• env BASE_CACHE_DIR=/private/tmp/base-cache-bankbuddy-118 UV_CACHE_DIR=/private/tmp/uv-cache-bankbuddy-118 BANKBUDDY_HOME=/private/tmp/bankbuddy-base-uv-smoke BANKBUDDY_ENV=dev /Users/rameshhp/work/base/bin/basectl run bankbuddy taxbuddy --workspace /private/tmp/bankbuddy-base-uv-workspace-118-codex -- status
• env BASE_CACHE_DIR=/private/tmp/base-cache-bankbuddy-118 UV_CACHE_DIR=/private/tmp/uv-cache-bankbuddy-118 /Users/rameshhp/work/base/bin/basectl test bankbuddy --workspace /private/tmp/bankbuddy-base-uv-workspace-118-codex -> 287 passed in 3.68s
• env BASE_CACHE_DIR=/private/tmp/base-cache-bankbuddy-118 UV_CACHE_DIR=/private/tmp/uv-cache-bankbuddy-118 ./tests/validate.sh -> 287 passed in 3.68s
• env BASE_CACHE_DIR=/private/tmp/base-cache-bankbuddy-118 UV_CACHE_DIR=/private/tmp/uv-cache-bankbuddy-118 /Users/rameshhp/work/base/bin/basectl run bankbuddy pytest --workspace /private/tmp/bankbuddy-base-uv-workspace-118-codex -- -q tests/test_packaging.py -> 1 passed in 0.01s
• git diff --check
• git diff --cached --check

Notes

• basectl check detects the uv project shape and reports expected follow-up warnings for the stale Base-managed project venv and dependency metadata ownership.
• Base GitHub auth probing still warns inside basectl check, while raw gh auth status -h github.com is authenticated. This is not related to BankBuddy uv support.

Checklist

• Branch name follows <category>/<issue>-<YYYYMMDD>-<slug>.
• Pull request is scoped to one issue, unless a documented multi-issue exception applies.
• Pull request body explains what changed and how it was validated.
• Relevant project checks pass.
• Documentation is updated when behavior or user-facing commands change.
• AI context is updated in .ai-context/, or the PR body explains why it is not applicable.
• CHANGELOG is updated for notable user-visible or release-worthy changes.
• Pull request includes Fixes #<issue> or Closes #<issue> when merge should close the issue.