v1.108.144 — deep-doc currency sweep

Documentation-only release: no behavior changes.

The deep references — ARCHITECTURE, SPEC, USER_GUIDE, CONFIGURATION, CONTEXT_PROVIDERS, TOKEN_SAVINGS — are brought current with the subsystems shipped over recent releases, via targeted additive sections:

• ARCHITECTURE: retrieval honesty signals (verdict / confidence / freshness), query-shape exact seeding, signal-channel fusion, find_implementations channels and the imported-never-generated evidence rule, adaptive tool tiers + schema budget + annotations, gold corpus and confidence provenance on the proof surface
• SPEC: the _meta honesty and provenance fields as protocol (negative_evidence states, confidence_provenance, query_shape, savings_provenance), tool annotations, exact-seeding semantics, meter conservatism guarantees
• USER_GUIDE: find_implementations and set_tool_tier added to the tool tables, exact-name query tip, verdict + provenance under retrieval health signals, the receipt CLI in the savings section
• CONFIGURATION: documented tool_profile, tool_tier_bundles, adaptive_tiering, allow_disabling_tier_controls, compact_schemas, allow_paid_summaries
• CONTEXT_PROVIDERS: built-in provider table expanded from 1 to 9 rows, descriptions sourced from the provider docstrings
• TOKEN_SAVINGS: meter conservatism, tokens-not-currency valuation at display time, the lifetime meter, the receipt CLI and its savings_provenance export

Companion to v1.108.143's UNDER_THE_HOOD.md — the manual is the narrative, these are the references it leans on.