feat(server): opt-in location interest for event subscriptions

[armancharan]

Issue for this PR

Related to #36443

#36443

Parent: #36441

✧ raised · ○ in review · ● approved · ✓ merged

#36441 epic: scope streams + bound payloads

Merge in order:
v2
└ ○ #37486 location interest ← this PR
   └ ○ #37487 session interest + fan-out bench
      └ ○ #37585 stream ownership / diagnostics
         └ ○ #37586 reconnect herd

Siblings under the epic (not git parents of the stack tip):
└ ○ #37559 session blobs + payloadHash
└ ○ #37570 ensure-on-first-failure → feeds #37586

First slice of the subscription-scope stack. Session narrowing continues in #37487.

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adds opt-in location interest on GET /api/event. Unscoped clients keep the global public feed. Scoped clients only receive matching location events (plus installation lifecycle / global.disposed). The feed still encodes each accepted public event once, then offers the shared frame to matching subscriber queues.

TUI connects with the resolved primary directory. Scope changes reconnect with a new query rather than overlapping streams. Architecture doc updated to match.

How did you verify your code works?

• bun test test/event-feed.test.ts in packages/server
• bun test test/promise.test.ts test/effect.test.ts in packages/client
• typecheck for protocol, server, client, tui, cli

Screenshots / recordings

n/a

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR