[Feature] Spec Index compaction — status-driven filtering of shipped specs

[KbWen]

Summary

Compact the Spec Index by folding shipped specs older than a threshold into a single summary line, keeping only active/frozen + recently-shipped specs inline.

Motivation

The Spec Index in current_state.md grows one line per spec forever. Long-shipped specs come to dominate the index and inflate every SSoT read. Status (Shipped) plus age is enough signal to fold them safely.

Proposed Solution

1. At /ship, squash shipped specs older than N days (e.g. 30) into "M specs shipped before YYYY-MM — see archive".
2. Keep active/frozen + recently-shipped specs inline.
3. Move folded bodies to .agentcortex/context/archive/specs/.

Files Affected

• .agentcortex/context/current_state.md (Spec Index)
• .agent/workflows/ship.md
• .agentcortex/context/archive/specs/

Scope

• Guardrail update (.agent/rules/)

---

Backlog: docs/specs/_product-backlog.md #11 (quick-win, depends on #1).

[KbWen]

Closing after re-audit. Verified there is no present pain point in this repo (e.g. archive ~13 files vs ~50 threshold; Spec Index ~9 entries already manually compacted; Domain Docs are small with no L2 bloat; no misroute/cache-staleness evidence). Premature — the backlog row remains as a future direction; reopen when a concrete signal appears.

[KbWen]

Reopening after a deeper, multi-pass verification (cross-checked against the actual code paths). Confirmed this is a real gap backed by an existing consumer/enforcement hook in this repo — not premature. Promoted to the 1-2 month optimization roadmap; see docs/specs/_product-backlog.md.