sync: upstream v0.79.9

[code-yeongyu]

Automated upstream sync for v0.79.9.

• Upstream SHA: 615bf2f87444c0f48756d487323519349304906c
• Evidence artifact: upstream-agent-qa-v0.79.9
• Release is evaluated only after this PR is merged with a merge commit.

QA completed before PR creation:

• npm run build
• npm run check
• npm test
• senpi-qa common, mock-loop, CLI smoke, and tmux TUI smoke when available

---

Summary by cubic

Sync to upstream v0.79.9. Adds base entry points and explicit provider registration for slimmer bundles, improves Windows shell execution, and updates repo automation.

• New Features

  • Added @earendil-works/pi-ai/base and @earendil-works/pi-agent-core/base for manual provider registration; default entries remain auto-registered.
  • Providers export register() (Anthropic, OpenAI, Azure OpenAI, Bedrock, Google, Vertex, Mistral, OpenAI Codex Responses, OpenRouter Images); registries expose clear*/get* helpers.
  • Model updates and compat tweaks (e.g., Fireworks GLM 5.2 thinking map; new OpenRouter image models); packages/ai adds ./base and ./openrouter-images exports.
  • Repo automation: new issue gate and triage label workflows, auto-remove inprogress on close, and a package report template.

• Bug Fixes

  • Windows legacy WSL bash.exe: commands are sent via stdin so shell variables expand correctly.
  • Coding agent update flow installs the exact checked version, supports --force, and reports old/new versions.
  • GitHub Copilot OAuth: filters models to the account’s allowed catalog and surfaces selected model ids.

^{Written for commit c160219. Summary will update on new commits.}

[code-yeongyu]

Closing stale automation PR. Upstream v0.79.9 was already merged and released by #60 / v2026.6.21; workflow #62 now refreshes origin/main, gates release on the sync PR being merged by the current run, waits for Check and test, and comments QA evidence on future sync PRs.