fix(kap-server): expose subagent fields in /tasks responses

[YaseenHQ]

Ports upstream cb30a7799 (MoonshotAI#2912): /tasks responses now carry agent_id, subagent_type and parent_tool_call_id, so a client can tell which agent a task belongs to and which tool call spawned it.

Small on its own — the more useful result is what the rest of this batch turned up. Six contested fixes were examined; two were already in our tree, applied by our own earlier work:

• 30f56a2d2 "disable SDK-internal retries that blocked cancellation" — maxRetries: 0 is already in all three providers (our feat(tui): refresh the TUI and sync upstream correctness fixes #45), and our version is newer: it resolves auth?.baseUrl ?? this._baseUrl where upstream still reads this._baseUrl.
• 2ee6e4312 "re-register the OAuth client when its redirect URI no longer matches" — invalidateStaleRegistration is in all four of our files (our 195f8d2b9), and ours reads await this.clientInformation() where upstream reads this.clientCache.

Both had been counted as "missing" by line-matching, because our divergence defeats exact-line comparison — exactly the failure mode that makes commit-by-commit archaeology unreliable for a fork this far along.

Also fixed a mistake of my own: merging the additive hunks dropped a registerTask line, leaving the single-task test referencing an undeclared subagentId. Caught by the suite, restored, and I stopped blind-unioning hunks after it.

Tested: full suite 17,102 passed / 0 failures; typecheck, lint, sherif, release:check and build clean.

[coderabbitai]

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