it12b: memory pack builder (budgeted, governed, conflict-aware)

[rinfa0108]

IT12B - Memory Pack Builder (budgeted, governed, conflict-aware)

Summary

Implements deterministic memory pack assembly to enable small-context agents to operate over large durable memory: policy/retention enforced, lifecycle defaults applied, dedupe by memory_key, conflict-safe surfacing, strict token budgeting.

Surfaces

• HTTP: POST /v1/memory/pack (deterministic default)
• MCP: openbrain.memory.pack (deterministic default)

Behavior

• Default retrieval: accepted + not expired (store defaults)
• Hybrid retrieval: structured + semantic candidate union
• Budget: hard cap with deterministic estimator ceil(chars/4)
• Dedupe: per memory_key with max_per_key default 1
• Conflict handling: conflict alerts + optional detailed ids
• Policy: memory_pack operation enforced + top_k clamp

Tests

• Added HTTP integration test: policy deny + clamp for memory pack
• Existing semantic provider/model selection tests remain green

Docs

• docs/specs/memory_pack_budgeting.md

Gates

pwsh scripts/ci/quality-gates.ps1
== Rust Gates ==
(all fmt/clippy/test checks passed)
... test result: ok across workspace suites ...
== Dependency Security/Policy ==
advisories ok
bans ok, licenses ok, sources ok
== Secret Scan ==
no leaks found