loss_report: land ticket #000022 (adapter LossReport sidecar)

Typed loss ledger for adapter / canonicalizer drops, transforms, and
normalizations. Sidecar — never enters cache_key, document_root,
run_dag_root, or audit_events. Loss policy lives in its own
loss_report_policy_hash so toggling reporting does NOT invalidate
prior QA cache entries (corrected pre-land per GPT-5.5 review).

- adapter_loss_reports table: PK (chunk_id, stage, canonicalization_version,
  loss_kind); columns include loss_mode {pure_drop|transform|quarantine|
  normalize}, bytes_dropped, occurrence_count, input/output_length_bytes,
  sample_excerpt, sample_hash, adapter_name/version, loss_report_policy_hash
- arborist/sources/loss_report.py: LossEvent, LossCollector with
  add()/record_delta()/set_lengths()/events(), record_losses() batched
  idempotent insert, compute_loss_report_policy_hash() pure function
- wikitext.to_base() emits ref_tag, self_closing_ref_tag, file_link,
  image_link, category_link, strip_code_transform, whitespace_run.
  loss_collector=None default keeps verifier/runner/query path unchanged
- html_page parse_html / _normalize_text emit script_block, style_block,
  html_chrome, whitespace_run; HtmlPageSource gains loss_report_*
  __init__ flags. Document-scope events anchor to first chunk_id at
  ingest via Document.extra['loss_events']
- ingest.ingest_source: per-chunk to_base() with collector for
  wikipedia_* sources; persisted via record_losses inside the same
  transaction as chunk inserts. Default loss_report_enabled=True
- arborist losses CLI subcommand: --document-root / --chunk-id /
  --kind / --stage / --summary / --json. arborist ingest gains
  --no-loss-report / --no-loss-excerpts / --loss-excerpt-bytes
- tests/test_loss_report.py: 15 tests covering bit-identical
  regression, loss-kind taxonomy, byte-conservation property test
  (loss-mode-aware), idempotent persistence, document_root invariant
  under toggle, policy hash purity

1091 tests pass, 0 audit-chain breaks across all 7 shards.

docs/TICKETS.md

@@ -60,7 +60,7 @@ Newest first. Update on every open/close.
 | #000025  | 5F battery (Function · Finetuning · Falsification · Formulate · Feedback Loop) | open · awaiting go/no-go | 2026-05-07 | —         |
 | #000024  | 5T Phase 1b + Dav1DPrometheus vocabulary alignment | open · awaiting go/no-go | 2026-05-07 | —         |
 | #000023  | 5S Phase 1b: Syllogism · Synthesis · Semiotics | open · awaiting go/no-go | 2026-05-07 | —         |
-| #000022  | Adapter LossReport (PRD I9 analogue)           | open · awaiting go/no-go | 2026-05-07 | —         |
+| #000022  | Adapter LossReport (PRD I9 analogue)           | closed · landed 2026-05-07 | 2026-05-07 | —         |
 | #000021  | 5S/5T/5R benchmark fixtures + harness          | in progress · Phase 1a landed 2026-05-07 | 2026-05-07 | —         |
 | #000020  | Capital-cost ledger (8-capital queues)         | closed · landed 2026-05-07 | 2026-05-07 | —         |
 | #000019  | Specification methodology for π* and V         | closed · landed 2026-05-07 | 2026-05-07 | —         |