fix(daemon): anchor saved sibling validation

[sethkarten]

Summary

• anchor saved/passive sibling validation to Core-03 immutable managed catalog
• validate stable id/path/depth/parent claims and fail closed on duplicate or conflicting topology
• add focused saved sibling and lazy subagent regression coverage

Stack

• Draft child of feat(daemon): reconstruct managed session catalog #1261 (core03-managed-session-catalog)

Validation

• Nonwriting Biome exact 3 paths: pass
• Root tsgo --noEmit: pass
• Configured env-clean focused/Core03 suite: 5 files, 245/245 tests pass
• diff-check and clean hygiene: pass

Exclusions

• no project-MCP, cleanup, lifecycle teardown, probe, or recovered-worker layers

---

Note

Medium Risk
Changes session naming and reservation for saved RLM siblings; malformed catalogs that previously slipped through are now rejected, which may block rename/create until data is fixed.

Overview
Saved passive sibling name checks in DaemonSupervisor now resolve each child’s parentSessionPath against that session file (canonicalSavedSiblingParentPath), so siblings that point at the same parent via different relative paths share one reservation key and one parent anchor for Core03 name validation.

assertSavedSiblingNameAvailable fails closed on ambiguous catalogs (duplicate ids/paths, mixed parents or depths, missing target) before calling assertAgentSessionNameAvailable. It synthesizes a local parent roster entry because catalog.siblings() only returns children, not the parent row.

Create and rename paths route saved targets through savedSiblingNameReservationInput instead of raw persisted parent strings. Regression tests cover structural conflicts, relative parent equivalence, and in-flight reservation races.

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Note

Fix saved sibling validation in DaemonSupervisor to anchor parent paths canonically

• Introduces canonicalSavedSiblingParentPath to resolve relative parentSessionPath values against each child session's file path, eliminating ambiguity from relative paths across siblings.
• assertSavedSiblingNameAvailable now fails closed on structurally ambiguous catalogs (duplicate ids/paths, mismatched parent or depth, missing target) before performing name conflict checks.
• sessionNameReservationInput and createOrReuseWorker now derive reservation inputs via savedSiblingNameReservationInput, unifying reservations across siblings that reference the same parent via different relative paths.
• Risk: validation is now stricter — previously accepted ambiguous or malformed sibling catalogs will now be rejected outright.

^{Macroscope summarized 1dd52db.}

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[sethkarten]

Superseded by #1334 as part of the physical Core/MCP stack split. The replacement preserves this PR’s reviewed semantic delta on the corrected shared #1243 foundation. Closing this PR to avoid duplicate review; branch retained for provenance.