docs: fix convergence-simplification-inventory drift and conflict marker

[Sinity]

Summary

Two doc-accuracy fixes to docs/design/convergence-simplification-inventory.md, both surfaced by the polylogue-iiu6r "automatic path already covers this, manual surface never deleted" audit.

Problem

1. A literal unresolved diff3 merge-conflict marker (||||||| b64a074e5) landed in item 5's history section via the 268-commit squash merge 5e23e6a (feat(archive): index v46 wire-evidence batch, free-threaded-only runtime, parse-failure recovery #3390) -- a duplicate, stale-ancestor "What it is" paragraph sat between the marker and the rest of the section.
2. Items 1 and 3 described process-pool machinery and the daemon's 64 MiB blob-limit constant as "deletable once X lands." X has now landed (the 3.14t free-threaded deploy; daemon_parse_stage_split's removal), but re-checking the current tree shows both items remain load-bearing for reasons the original text didn't anticipate.

Solution

• Removed the conflict marker and the duplicate stale paragraph in item 5, keeping the more detailed, currently-line-numbered text that follows it.
• Item 1 (process-pool machinery): added a status note. Only the one call site the row names (_parse_unique_retained_raws in revision_backfill.py) was retired. Three other unconditional call sites remain -- pipeline/services/ingest_batch/_core.py:1053, pipeline/services/validation_flow.py:185 (measured Threads(24)=160MB/s vs Process(8)=605MB/s, a 3.7x win independent of the GIL/free-threaded argument), and pipeline/services/archive_ingest.py:279 -- none gated on parallel_threads_effective(), so the free-threaded deploy does not collapse them.
• Item 3 (64 MiB daemon blob-limit constant): added a status note. raw_materialization_whale_pass_candidate (polylogue-t93b, added after this row was written) now threads _RAW_MATERIALIZATION_DAEMON_BLOB_LIMIT_BYTES through as ordinary_max_payload_bytes, the boundary distinguishing the daemon's ordinary trickle envelope from its escalation-tier whale pass -- a capability unrelated to DaemonParseStage's in-flight budget.

The original design-time reasoning under each item is kept for history (matching item 5's existing convention for documenting a superseded/failed deletion attempt in place), with new status notes marking it stale rather than deleting it.

Verification

• devtools render all --check -- exit 0, no "out of sync" lines.
• devtools verify --quick -- exit 0, all 19 steps pass (also ran automatically via the pre-push hook).

Ref polylogue-gzyqk, polylogue-btv32

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📥 Commits

Reviewing files that changed from the base of the PR and between e98811a and 76e3ddc.

📒 Files selected for processing (2)

• .beads/issues.jsonl
• docs/design/convergence-simplification-inventory.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/docs/convergence-inventory-drift-fix

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