fix(sessions): require conversation-id matches before donating trusted titles

[Ni7e]

Root cause

zcode keeps every conversation in one SQLite database, so every bound Ghostex zcode session carries the same runtimeSettings.agentSessionPath (~/.zcode/cli/db/db.sqlite).

The trusted-title sibling hunt (select_trusted_title_for_identity) accepted a candidate when agentSessionPath matched and session ids were absent. For per-conversation transcript files (Claude, Codex) path equality proves the same conversation; for zcode it matches every sibling in the project.

A fresh pane's SessionStart identity update (row title still a placeholder) therefore adopted the most recently active sibling's title and recorded it with the donor's titleSource. A user-pinned name spread to new sessions, and since user outranks terminal-auto/generated forever, the wrong name stuck even after zcode named its own conversation.

Reproduction (the "111" bug)

1. A zcode session in a project gets a user title (rename modal, or an imported zcode conversation whose title came from the user's first prompt).
2. Create a new zcode session in the same project. Within its first seconds the sidebar shows the pinned name instead of "ZCode Session".
3. If the donation lands before the pane binds its own conversation, the row keeps the name permanently while agentActivity.lastTitle keeps showing the real title.

Observed live: five rows in one project stuck on a user-pinned name across several days, and every new zcode session briefly adopting the newest sibling's title (confirmed with a ghostex create-agent launch).

Fix

• identities_match becomes identities_match_strength, returning ConversationId or StorePath. For shared-store agents (zcode) the path fallback returns nothing, so sibling donations require conversation-id equality. (Hermes also keeps conversations in one state.db, but its identity path is the per-conversation mirror file, so its fallback stays safe.)
• Donations that matched only by store path are saved as terminal-auto instead of the donor's user, so the conversation's real title always replaces them. Id-confirmed candidates (resume/restore of the same conversation) keep the donor's source, so restoring a renamed session still restores its name.

Verification

• cargo check clean; agents:: (45) and title (50) lib tests pass on current main.
• Manual: with a user-pinned zcode row present, new zcode sessions no longer adopt it; previously the donation reproduced deterministically on launch.

Complementary to #141 (rename ZCode sessions through its own title store): the SQLite custom-title writes #141 lands in the zcode store are what the metadata sync then adopts without being overridden.

Note

Require conversation-id match before donating trusted titles in apply_session_state_update

• Replaces the boolean identities_match with identities_match_strength returning ConversationId or StorePath, so callers can distinguish a true same-conversation match from a path-only fallback
• Adds a same_conversation flag to TrustedTitleCandidate; user-sourced candidates that are only path-matched are downgraded to terminal-auto on persistence, while conversation-ID-confirmed candidates keep their original source
• Disallows path-only identity matches for zcode agents, whose shared /.zcode/cli/db/db.sqlite path is no longer treated as proof of a shared conversation
• infer_agent_id_from_path now normalizes backslashes to forward slashes before matching, extending agent recognition to Windows-style paths
• Risk: historical and sibling session title donations from shared-store agents (non-zcode) are no longer accepted on path-only matches; reviewers should check select_trusted_title_for_identity and create_history_title_candidate in identity.rs to confirm no legitimate title source is lost

^{Macroscope summarized 00827ac.}

Summary by CodeRabbit

• Bug Fixes
  • Improved conversation identity matching by distinguishing exact conversation matches from shared storage-path matches.
  • Prevented titles from being incorrectly treated as user-confirmed when originating from an unrelated conversation using the same storage location.
  • Improved title attribution and session state handling for agents using shared stores.
  • Improved recognition of shared-store sessions across platforms with differing path separators.

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• server/src/agents/identity.rs

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📝 Walkthrough

Walkthrough

Identity matching now reports conversation or store-path strength and excludes path-only matches for shared-store agents. Trusted title candidates retain conversation provenance, and non-confirmed user titles are stored as terminal-auto.

Changes

Identity and title provenance

Layer / File(s)	Summary
Identity match strength server/src/agents/identity.rs, server/src/domain/repository/session.rs	identities_match is replaced by identities_match_strength. The new result distinguishes ConversationId and StorePath matches and rejects path-only matches for shared-store agents. Repository documentation reflects the updated matching rules.
Trusted title provenance server/src/agents/identity.rs	TrustedTitleCandidate records whether a candidate belongs to the same conversation. Live, historical, and event-title candidates propagate this value. A user-sourced candidate without conversation confirmation is stored with terminal-auto.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Suggested reviewers: maddada

Merge Risk: 🔵 Low · up to ae498

Some shared-store zcode sessions can still inherit an unrelated title, and an unverified event title can remain pinned as user-sourced. These are localized title correctness issues that should be addressed before relying on the new provenance behavior.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: requiring conversation-ID matches before donating trusted titles.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 2

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Inline comments:
In `@server/src/agents/identity.rs`:
- Around line 1104-1122: Update infer_agent_id_from_path and the path-only
identity resolution used by resolve_session_identity so zcode paths infer the
zcode agent ID when no explicit or runtime agent ID exists. Preserve explicit
and runtime zcode identities, ensuring identities_match_strength applies the
shared-store guard before StorePath matching and does not treat sibling zcode
conversations as the same conversation.
- Around line 875-878: Update select_trusted_title_for_identity and the
create_trusted_title_candidate event-title path so same_conversation is true
only when the event’s conversation or agent-session ID explicitly matches the
target identity. For missing or unverified IDs, downgrade or reject the event
candidate rather than allowing it to persist as an unchanged user source.

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• server/src/agents/identity.rs
• server/src/domain/repository/session.rs

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