OPS-POLISH-001: Polish public repository status docs

[ktalpay]

Motivation

• Remove stale "baseline/planned" wording and align public docs with the current develop-state evidence for a narrow project-level production-ready operator path.
• Improve first-impression navigation, conservative status language, and contributor/maintainer runbook guidance without changing runtime code or behavior.
• Add an explicit maintainer release/sync checklist to guide develop-to-main sync, hygiene, and first alpha/review readiness.

Description

• Updated README to present a narrow production-ready operator path, clarify active Python runtime and .NET parity evidence, add explicit non-claims, and improve Start Here navigation and database/runbook links; no runtime/code changes were made (README.md).
• Reworked documentation index for clearer visitor flows (Start Here, runtime runbooks, DB/PostgreSQL, Phase 2/review gate, contribution/support/security) (docs/index.md).
• Added a maintainer release and sync checklist (docs/maintainer-release-checklist.md) covering develop-to-main alignment, stale PR/issue review, release/tag readiness, and repository hygiene.
• Replaced stale/planning wording in several supporting docs to reflect the active Phase 1 posture and .NET parity evidence and to use conservative terminology without expanding claims (docs/engineering-standards.md, docs/ingestion-metadata-model.md, docs/limitations.md, docs/production-readiness-gap-analysis.md, docs/roadmap.md, docs/source-acquisition-boundary.md, docs/source-ingestion-boundaries.md, docs/task-breakdown.md).
• No Python/.NET/runtime/database code, schema, or dependencies were changed and no secrets or generated artifacts were added.

Testing

• Local Markdown link consistency check (python - <<'PY' ... PY) passed and confirmed all changed-doc local links resolve.
• Stale-phrase grep check (rg -n "early Phase 1|documentation baseline|CI not configured yet|Python planned|\.NET planned|implementation begins" README.md) returned no matches, so README stale phrase check passed.
• git diff --check ran and passed with no whitespace/patch errors.
• Targeted unit test run (python -m pytest tests/test_configured_cycle_runner.py) passed: 21 tests passed in ~1.1s.
• git status --short was inspected and temporary __pycache__ files were removed before committing; committed change set contains only intended docs changes (commit created with message: "Polish public project status docs").

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[chatgpt-codex-connector]

Remove stale .NET gap text

When readers use this gap analysis after the status-doc refresh, this new parity-evidence sentence conflicts with the same section's remaining gap list and closing sentence, which still say the .NET path needs project structure/runtime entry points and that parity should begin later. That makes the public readiness guidance internally inconsistent, so the stale .NET gap text should be reconciled with the new claimed parity scope.

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