fix(cli): reset slash-command conflict dedupe after each flush

[kunalrawat425]

Summary

• SlashCommandConflictHandler.notifiedConflicts was an unbounded Set that grew for the entire process lifetime.
• Once a conflict key was recorded, it was never removed, so a conflict that disappeared and later reappeared would silently be suppressed forever.
• Fix: clear notifiedConflicts inside flush() after each debounce window. Deduplication still works within a single burst of events, but the slate is wiped after flushing so reintroduced conflicts trigger fresh notifications.

Changes

File	What changed
packages/cli/src/services/SlashCommandConflictHandler.ts	this.notifiedConflicts.clear() added at top of flush()
packages/cli/src/services/SlashCommandConflictHandler.test.ts	Replaced old dedup test with two tests: one for intra-window dedup and one regression test for reintroduced conflicts

Test plan

• npx vitest run packages/cli/src/services/SlashCommandConflictHandler.test.ts — all 8 tests pass
• New test should re-notify when a previously-resolved conflict reappears (issue #24333) confirms the fix

Fixes #24333

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where slash-command conflicts were being permanently suppressed after their initial notification. By clearing the deduplication state after each flush, the system now correctly allows for fresh notifications if a conflict is resolved and subsequently reintroduced.

Highlights

• Conflict Deduplication Fix: Modified the SlashCommandConflictHandler to clear the notifiedConflicts set after each flush, ensuring that conflicts are re-evaluated after the debounce window.
• Regression Testing: Updated the test suite to include a specific regression test for re-notifying users when a previously resolved conflict reappears.

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[github-actions]

📊 PR Size: size/S

• Lines changed: 26
• Additions: +24
• Deletions: -2
• Files changed: 2

[gemini-code-assist]

Code Review

This pull request addresses issue #24333 by clearing the notifiedConflicts deduplication set after each flush in SlashCommandConflictHandler. This ensures that if a conflict disappears and subsequently reappears, a fresh notification is triggered. Corresponding unit tests have been updated and added to verify this behavior. No review comments were provided, so there is no feedback to address.