…ive hits during session visibility filtering

Two coupled regressions together made post-reset memory_search return
empty on archived session content, even when the live session was
visible to the requester.

1. `buildSessionEntry` short-circuits every archive file (`.reset`,
   `.deleted`, `.bak`) to `{ content: '', lineMap: [] }` via
   `shouldSkipTranscriptFileForDreaming`. That is correct for opaque
   backups and compaction checkpoints, but it also zeros out the two
   usage-counted archive kinds (`.jsonl.reset.<iso>` and
   `.jsonl.deleted.<iso>`) that are meant to be searchable as the
   rotated copy of a real session. No chunks are ever produced from
   them, so `memory_search` has nothing to return.

2. `extractTranscriptStemFromSessionsMemoryHit` recognises only
   `.jsonl` and `.md` suffixes. Even if archive content is indexed,
   hits land on `sessions/<stem>.jsonl.reset.<iso>` paths that the
   stem extractor resolves to `null`, so
   `filterMemorySearchHitsBySessionVisibility` drops them before the
   guard check runs.

Fix

- `shouldSkipTranscriptFileForDreaming` now distinguishes
  usage-counted archives from opaque ones: compaction checkpoints and
  non-usage-counted archives (`.bak`, legacy store backups) stay
  skipped; `.jsonl.reset.<iso>` and `.jsonl.deleted.<iso>` fall through
  to the normal JSONL reader and produce searchable content,
  `lineMap`, and timestamps like any other session transcript.

- `extractTranscriptStemFromSessionsMemoryHit` learns the archive
  suffix shape (`\.jsonl\.(?:reset|deleted)\.<iso>$`) and maps those
  hit paths back to the same live `<stem>`. The existing visibility
  guard (`resolveTranscriptStemToSessionKeys` →
  `createSessionVisibilityGuard`) is then authoritative and gates the
  archive hit against the same session entry as a live `.jsonl` hit.

Security / scope

- No change to the authoritative visibility guard. An archive hit for
  a session the requester cannot see is still dropped, just further
  downstream than before (at the guard instead of silently at stem
  extraction / empty-content). `.bak` and compaction checkpoints still
  produce no searchable content.

Tests

- `packages/memory-host-sdk/src/host/session-files.test.ts` now
  asserts that reset/deleted archives produce real content and
  `lineMap`, while `.bak` and compaction checkpoints stay empty.
- `src/plugin-sdk/session-transcript-hit.test.ts` covers both
  archive suffixes with and without the `sessions/` prefix, plus a
  negative case rejecting unrelated `.jsonl.backup.` shaped suffixes.

Refs openclaw#56131. Follow-up to openclaw#76311 (socket retry).

AI-assisted: Prepared with Claude (Opus 4.7). Validated locally with
`pnpm check` (typecheck/lint/guards EXIT 0) and the exact vitest AC
set from the earlier Codex review (session-transcript-hit,
session-files, session-search-visibility, memory/index) all green.

… delta threshold for usage-counted archives so new reset/deleted artifacts index incrementally

Two coupled gaps together meant post-reset `.jsonl.reset.<iso>` /
`.jsonl.deleted.<iso>` archives never entered `chunks` on the
incremental memory sync path, only on a manual
`openclaw memory index --force` full reindex.

1. `archiveFileOnDisk` renamed the live `.jsonl` onto disk but never
   emitted a `sessionTranscriptUpdate` event, so the memory sync's
   `ensureSessionListener` never learned the archived path existed.
   Every other in-process session-file mutation already goes through
   `emitSessionTranscriptUpdate` (appendMessage, compaction,
   tool-result rewrite, chat transcript inject, command execution,
   pi-embedded tool-result truncation, `config/sessions/transcript`
   append/truncate plumbing, session tool-result guard); archive was
   the sole emit gap.

2. Even with the emit in place, `processSessionDeltaBatch` would
   forward the event to `updateSessionDelta` and gate it behind the
   `deltaBytes` / `deltaMessages` thresholds (defaults
   `agents.defaults.memorySearch.sync.sessions.deltaBytes: 100000` and
   `deltaMessages: 50`). Those thresholds are designed for live
   transcripts accumulating appended messages; a one-shot archive
   rename below the threshold would never be marked dirty and never
   trigger a session-delta sync, so the archive would still not
   reindex.

Fix

- `src/gateway/session-transcript-files.fs.ts::archiveFileOnDisk`
  emits `emitSessionTranscriptUpdate({ sessionFile: archived })` after
  `fs.renameSync`. Same pattern as the eight existing emit points.

- `extensions/memory-core/src/memory/manager-sync-ops.ts::`
  `processSessionDeltaBatch` now short-circuits the delta accounting
  for usage-counted archive artifacts (classified by
  `isSessionArchiveArtifactName` + `isUsageCountedSessionTranscriptFileName`),
  marking the archive path dirty directly and triggering a session-delta
  sync regardless of size. `.jsonl.bak.<iso>` is explicitly NOT treated
  as usage-counted and therefore does not bypass \u2014 it stays opaque to
  the indexer the same way `buildSessionEntry` already skips it.

- `packages/memory-host-sdk/src/engine-qmd.ts` re-exports the two
  classification helpers so memory-core can consume them via the
  existing plugin-sdk boundary.

Scope

- No change to indexing policy for live transcripts, the chokidar
  watch set, force-reindex behavior, visibility filtering, the
  downstream `onSessionTranscriptUpdate` contract, or the archive
  `.bak`/compaction-checkpoint skip list. The authoritative visibility
  guard remains authoritative.

Tests

- `src/gateway/session-transcript-files.fs.archive-events.test.ts`
  asserts archive emit for reset / deleted / bak.
- `extensions/memory-core/src/memory/manager-sync-ops.archive-delta-bypass.test.ts`
  locks in the classification invariants the bypass depends on
  (reset+deleted bypass, bak explicitly does not, live `.jsonl`
  explicitly does not, compaction checkpoint does not), plus an
  end-to-end verification that `emitSessionTranscriptUpdate` delivers
  the archived path verbatim through the transcript-events bus.

Refs openclaw#56131. Follow-up to openclaw#76311 (socket retry, merged) and openclaw#76452
(archive content indexing + visibility stem). Together with those two
PRs this closes the archive-path memory indexing story: archive files
are read (`openclaw#76452`), mapped back to the live transcript stem
(`openclaw#76452`), the archive event is emitted (this PR), and the memory
sync incremental path now actually reindexes the archive instead of
dropping the event at the delta gate (this PR).

AI-assisted: Prepared with Claude (Opus 4.7). Validated locally with
`pnpm check` EXIT 0 and the two new test files (6 + 8 passed across
all three gateway test environments + extension-memory environment).

Summary:
- The PR broadens memory-core's embedding retry classifier for socket/network errors, adds focused classifier tests, and adds an Unreleased changelog fix.
- Reproducibility: yes. Current main's retry classifier rejects the socket/fetch samples, and the reindex embedding path delegates to that classifier; a read-only regex probe confirmed the PR accepts the target samples.

Automerge notes:
- PR branch already contained follow-up commit before automerge: fix(memory): retry reindex on socket errors

Validation:
- ClawSweeper review passed for head b4618c4.
- Required merge gates passed before the squash merge.

Prepared head SHA: b4618c4
Review: openclaw#76311 (comment)

Co-authored-by: buyitsydney <buyitsydney@users.noreply.github.com>
Co-authored-by: clawsweeper <274271284+clawsweeper[bot]@users.noreply.github.com>

Summary:
- The PR broadens memory-core's embedding retry classifier for socket/network errors, adds focused classifier tests, and adds an Unreleased changelog fix.
- Reproducibility: yes. Current main's retry classifier rejects the socket/fetch samples, and the reindex embedding path delegates to that classifier; a read-only regex probe confirmed the PR accepts the target samples.

Automerge notes:
- PR branch already contained follow-up commit before automerge: fix(memory): retry reindex on socket errors

Validation:
- ClawSweeper review passed for head b4618c4.
- Required merge gates passed before the squash merge.

Prepared head SHA: b4618c4
Review: openclaw#76311 (comment)

Co-authored-by: buyitsydney <buyitsydney@users.noreply.github.com>
Co-authored-by: clawsweeper <274271284+clawsweeper[bot]@users.noreply.github.com>

Summary:
- The PR broadens memory-core's embedding retry classifier for socket/network errors, adds focused classifier tests, and adds an Unreleased changelog fix.
- Reproducibility: yes. Current main's retry classifier rejects the socket/fetch samples, and the reindex embedding path delegates to that classifier; a read-only regex probe confirmed the PR accepts the target samples.

Automerge notes:
- PR branch already contained follow-up commit before automerge: fix(memory): retry reindex on socket errors

Validation:
- ClawSweeper review passed for head b4618c45324ad00e15ce8488f0c3aff9bf6d0ce1.
- Required merge gates passed before the squash merge.

Prepared head SHA: b4618c45324ad00e15ce8488f0c3aff9bf6d0ce1
Review: openclaw/openclaw#76311 (comment)

Co-authored-by: buyitsydney <buyitsydney@users.noreply.github.com>
Co-authored-by: clawsweeper <274271284+clawsweeper[bot]@users.noreply.github.com>

Summary:
- The PR broadens memory-core's embedding retry classifier for socket/network errors, adds focused classifier tests, and adds an Unreleased changelog fix.
- Reproducibility: yes. Current main's retry classifier rejects the socket/fetch samples, and the reindex embedding path delegates to that classifier; a read-only regex probe confirmed the PR accepts the target samples.

Automerge notes:
- PR branch already contained follow-up commit before automerge: fix(memory): retry reindex on socket errors

Validation:
- ClawSweeper review passed for head b4618c45324ad00e15ce8488f0c3aff9bf6d0ce1.
- Required merge gates passed before the squash merge.

Prepared head SHA: b4618c45324ad00e15ce8488f0c3aff9bf6d0ce1
Review: openclaw/openclaw#76311 (comment)

Co-authored-by: buyitsydney <buyitsydney@users.noreply.github.com>
Co-authored-by: clawsweeper <274271284+clawsweeper[bot]@users.noreply.github.com>

Summary:
- The PR broadens memory-core's embedding retry classifier for socket/network errors, adds focused classifier tests, and adds an Unreleased changelog fix.
- Reproducibility: yes. Current main's retry classifier rejects the socket/fetch samples, and the reindex embedding path delegates to that classifier; a read-only regex probe confirmed the PR accepts the target samples.

Automerge notes:
- PR branch already contained follow-up commit before automerge: fix(memory): retry reindex on socket errors

Validation:
- ClawSweeper review passed for head b4618c45324ad00e15ce8488f0c3aff9bf6d0ce1.
- Required merge gates passed before the squash merge.

Prepared head SHA: b4618c45324ad00e15ce8488f0c3aff9bf6d0ce1
Review: openclaw/openclaw#76311 (comment)

Co-authored-by: buyitsydney <buyitsydney@users.noreply.github.com>
Co-authored-by: clawsweeper <274271284+clawsweeper[bot]@users.noreply.github.com>

Summary:
- The PR broadens memory-core's embedding retry classifier for socket/network errors, adds focused classifier tests, and adds an Unreleased changelog fix.
- Reproducibility: yes. Current main's retry classifier rejects the socket/fetch samples, and the reindex embedding path delegates to that classifier; a read-only regex probe confirmed the PR accepts the target samples.

Automerge notes:
- PR branch already contained follow-up commit before automerge: fix(memory): retry reindex on socket errors

Validation:
- ClawSweeper review passed for head b4618c4.
- Required merge gates passed before the squash merge.

Prepared head SHA: b4618c4
Review: openclaw#76311 (comment)

Co-authored-by: buyitsydney <buyitsydney@users.noreply.github.com>
Co-authored-by: clawsweeper <274271284+clawsweeper[bot]@users.noreply.github.com>

Summary:
- The PR broadens memory-core's embedding retry classifier for socket/network errors, adds focused classifier tests, and adds an Unreleased changelog fix.
- Reproducibility: yes. Current main's retry classifier rejects the socket/fetch samples, and the reindex embedding path delegates to that classifier; a read-only regex probe confirmed the PR accepts the target samples.

Automerge notes:
- PR branch already contained follow-up commit before automerge: fix(memory): retry reindex on socket errors

Validation:
- ClawSweeper review passed for head b4618c4.
- Required merge gates passed before the squash merge.

Prepared head SHA: b4618c4
Review: openclaw#76311 (comment)

Co-authored-by: buyitsydney <buyitsydney@users.noreply.github.com>
Co-authored-by: clawsweeper <274271284+clawsweeper[bot]@users.noreply.github.com>

Summary:
- The PR broadens memory-core's embedding retry classifier for socket/network errors, adds focused classifier tests, and adds an Unreleased changelog fix.
- Reproducibility: yes. Current main's retry classifier rejects the socket/fetch samples, and the reindex embedding path delegates to that classifier; a read-only regex probe confirmed the PR accepts the target samples.

Automerge notes:
- PR branch already contained follow-up commit before automerge: fix(memory): retry reindex on socket errors

Validation:
- ClawSweeper review passed for head b4618c4.
- Required merge gates passed before the squash merge.

Prepared head SHA: b4618c4
Review: openclaw#76311 (comment)

Co-authored-by: buyitsydney <buyitsydney@users.noreply.github.com>
Co-authored-by: clawsweeper <274271284+clawsweeper[bot]@users.noreply.github.com>