Release v0.8.17

[ekalb81]

Version bump only — 0.8.16 → 0.8.17 across the five manifests.

Three merged changes:

• Add durable_sessions(last_seen_at_ms DESC, session_key) index to fix hydration temp B-tree spill (#168) #179 (Hydrate peak is SQLite's sorter spilling (2,952 MB); an index on durable_sessions removes it (82x, measured) #168) — index durable_sessions(last_seen_at_ms DESC, session_key). stream_sessions sorted the snapshot walk with no supporting index, so SQLite built a spilling temp B-tree. Measured on a 2,500-session / 1.13 GB corpus: peak +286.7 MB → +0 MB, stream_sessions 8.568 s → 3.792 s. Ledger schema v8 → v9; the one-time index build measured 3.74 ms on a 4,826-row corpus, since durable_sessions is narrow and the multi-GB blobs live in a separate table.
• Fix #174: persist rebuild's collapsed sessions into the scan cache #175 (Rebuild history is undone by the next scan: cached uncollapsed sessions are written back, ledger re-inflates 2.46 to 3.30 GB #174) — a rebuild's collapsed sessions are now persisted into the scan cache, so the next startup scan stops writing the pre-collapse payload back. Without this a rebuild was undone within minutes.
• Map gpt-daybreak-blue-latest to gpt-5.6-sol (rate card v9) #178 — gpt-daybreak-blue-latest maps to gpt-5.6-sol, clearing a fallback-rate warning on usage that was already priced correctly. Rate card v9.

Not exercised in any recording yet: the post-VACUUM WAL checkpoint shipped in v0.8.16, and now this index migration on a real multi-GB ledger.

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