fix(installer): remove commit and pull request prompts

[nicknisi]

Complete AUTH-6733: remove installer commit-changes and open-PR prompts and automatic commit/push/PR behavior across current CLI, TUI and headless flows, retaining safe compatibility for legacy flags and truthful completion reporting. Adapt existing PR217 to current main and add negative regression tests proving generated changes remain uncommitted.

Riker's check bun run test && bun run typecheck && bun run lint && bun run format:check passed.

Opened as a draft by Riker (job 14).

[linear-code]

AUTH-6733

[greptile-apps]

Confidence Score: 5/5

[Medium risk] Removes commit and pull request automation from the installer.

The PR appears safe to merge based on the reviewed changes.

Summary

The PR removes installer-controlled commits, pushes, and pull requests while retaining legacy flags as no-ops.

• Completion now reports Git inspection outcomes and tells users to review and commit changes themselves.
• New tests cover the parser, installer flows, staged-work preservation, and bounded inspection.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[Installer succeeds] --> B[Inspect install directory]
  B --> C{Inspection outcome}
  C -->|Changed| D[Report current changed files]
  C -->|Unchanged| E[Report no Git changes]
  C -->|Unavailable| F[Report files unknown]
  D --> G[Complete without staging or publishing]
  E --> G
  F --> G

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_{Reviews (2) · Last reviewed commit: "fix: bound post-install Git change inspe..."}