refactor: remove completed audit bloat

[vnedyalk0v]

Context

This follows the ponytail audit cleanup by removing completed planning artifacts and cutting the remaining unsupported or duplicated workflow surface.

Changes

• Delete completed plans/ backlog, stale pre-MVP planning docs, and retained /flow-watch spike notes.
• Replace full duplicated config examples with small project override examples and link docs to the maintained example files.
• Add short descriptions for each maintained example config so docs remain readable/searchable without duplicating JSON.
• Add a shared command argument helper and remove duplicated parser blocks from command modules.
• Remove unsupported config surface: extends, check-level timeoutSeconds, short-sha collision mode, and no-op safety flags.
• Consolidate repeated template loading, command error formatting, and JSON parse/clone wrappers.
• Preserve the public renderPrTitle export through src/index.ts.

Verification

• npm run check passed: JSON, text safety, docs format, typecheck, and 63 Vitest files / 505 tests.
• Follow-up docs edit: npm run check:docs passed.
• git diff --check passed.

Self-review

• Confirmed branch refactor/remove-audit-bloat is the open head branch for PR refactor: remove completed audit bloat #57 against dev.
• Confirmed unsupported config keys now fail schema validation instead of being accepted as no-ops.
• Confirmed behavior-preserving template-loader refactor is covered by existing renderer/template tests plus the full suite.

Risk

Medium. Projects using removed compatibility/config fields now fail validation and must switch to the supported fields. Main external-code risk remains deep imports of files deleted earlier in this PR; package public exports remain intact for renderPrTitle.

Rollback

Revert commits da16cb2, 2082f17, and 7e3d4fe.

Linked issues

None.

[vnedyalk0v]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🎉

Reviewed commit: da16cb25c8

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