v1.88.1.0 fix: harden credential boundaries and owned state (#2942)

* fix(settings): preserve symlinked settings targets

Resolve the selected target for locking, mutation, backup, and rollback; refuse target changes and preserve private modes. Addresses #2830.

* fix(redact): bind masking to original detected spans

Inspired by #2929's anchored-span diagnosis; independently implemented using normalization offsets. Addresses #2930 and the relocation portion of #2912 without changing detection sensitivity.

* fix(evals): exclude operator credentials from prefix admission

Adapts the credential-suffix screen proposed in #2636, with real launched-child regression coverage and deliberate provider-auth exceptions.

* fix(artifacts): retain custom allowlist rules on reinitialization

Preserve the exact user-owned suffix and publish only a successfully assembled replacement. Independently implements the repair reported in #2907.

* test(cso): verify exact masked reads and unmaskable payload refusal

* fix(cso): preserve exact filesystem identities through lease recovery

Preserve 64-bit device/inode identity and nanosecond race checks. Add native NTFS lifecycle coverage for #2927; retain ambiguous legacy-state refusal without claiming Windows PID-reuse recovery is resolved.

* fix(redact): bind pre-push scans to destination and preserve seam context

Uses #2935 (bd07318) as source evidence for push-target range and slice-overlap defects. Independently implemented; no cherry-pick or release metadata adoption.

* test(ci): gate native agent ownership and settings links on macOS

* fix(browse): bind agent lifetimes and cleanup to owned generations

Uses #2931 by Chris Hutton / Claude Fable 5.1 as attributed design input; independently implemented without broad sweeps or copied code. Keep uncertain children and locks rather than deleting foreign state.

* test(ci): include concurrent shutdown controls in the native macOS gate

* v1.88.1.0 fix: harden credential boundaries and owned state

* fix(redact): preserve target provenance and scan boundary semantics

* test(artifacts): read managed rules from atomic allowlist assembly

* fix: preserve native exit observations and fixture prerequisites

* fix: preserve UTF-16 offsets through redaction normalization

docs/BROWSER_INTERNALS.md

@@ -21,11 +21,12 @@ here usually trace to not understanding the cross-component flow.
 
 **Embedder terminal-agent ownership** (v1.42.1.0+, identity-based kill v1.44.0.0+).
 `buildFetchHandler` in `browse/src/server.ts` accepts `ServerConfig.ownsTerminalAgent?:
-boolean` (default `true`). When `true`, factory shutdown runs the full teardown:
-identity-based kill via `killAgentByRecord(readAgentRecord(stateDir))` from
-`browse/src/terminal-agent-control.ts` plus `safeUnlinkQuiet` on
-`<stateDir>/terminal-port`, `<stateDir>/terminal-internal-token`, and
-`<stateDir>/terminal-agent-pid` (the per-boot agent record introduced in v1.44).
+boolean` (default `true`). When `true`, factory shutdown acquires
+`acquireAgentStateLock(stateDir)` and checks daemon ownership. It removes
+`terminal-port`, `terminal-internal-token`, and the matching `terminal-agent-pid`
+record only when the recorded agent is absent, already dead, or confirmed stopped
+by `stopAgentByRecord`. Uncertain identity or exit, an unavailable lock, or
+successor-owned daemon state leaves those files intact.
 Embedders (e.g. the gbrowser phoenix overlay) that pre-launch their own PTY
 server must pass `false` so their discovery files survive gstack teardown cycles.
 The flag is the third caller-owned teardown gate in `ServerConfig` (alongside