docs(gsd): bootstrap planning and phase-1 discussion artifacts

.planning/phases/01-collectors-and-api-flow-hardening/CONTEXT.md

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+# Phase 1 Context
+
+## Phase
+
+Phase 1: Collectors and API flow hardening
+
+## Focus
+
+- Endpoint collectors must continuously send data without silent hangs.
+- AW server must accept/query data for UI pages consistently.
+- Failure points around transport/CORS/runtime must be explicitly checked.
+
+## Initial Acceptance Targets
+
+- Endpoint collector heartbeats arrive regularly.
+- Browser domains and endpoint signals appear in corresponding buckets.
+- Activity page for target host shows non-zero timeline/events for active period.

.planning/phases/01-collectors-and-api-flow-hardening/PLAN.md

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+# PLAN — Phase 01: collectors-and-api-flow-hardening
+
+## Goal
+
+Deliver stable collector-to-server data flow so activity/worktime pages have consistent data.
+
+## Work Items
+
+1. Validate collector runtime and log rotation behavior.
+2. Validate server ingest endpoints and bucket write/read checks.
+3. Validate CORS/origin and report link consistency.
+4. Add/adjust scripts or runbook checks to detect zero-data regressions early.
+
+## Verification
+
+- Manual and scripted checks show fresh events in target buckets.
+- Host activity page reflects real activity (not `0s`) for active sessions.
+- No repeating transport errors in collector logs during test window.
+
+## Status
+
+Planned.