docs(observability): document phase-0 telemetry and baseline workflow

docs/plans/artifacts/phase0_baseline_2026-02-25.md

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+# Phase 0 Baseline Telemetry Summary
+
+- Run state events: 0
+- Run cancel events: 0
+- Reaction matches: 0
+- Reaction skips: 0
+
+## Run Outcomes (Overall)
+
+- Total outcomes: 0
+- Complete: 0 (n/a)
+- Cancelled: 0 (n/a)
+- Errors: 0 (n/a)
+- Cancel requested: 0
+- Starts: 0
+
+## Run Outcomes by Channel
+
+| Channel | Outcomes | Complete | Cancelled | Error | Complete % | Cancel % | Error % | Cancel Req | Starts |
+| --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
+| _none_ | 0 | 0 | 0 | 0 | n/a | n/a | n/a | 0 | 0 |
+
+## Run Outcomes by Session
+
+| Session | Outcomes | Complete | Cancelled | Error | Complete % | Cancel % | Error % | Cancel Req | Starts |
+| --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
+| _none_ | 0 | 0 | 0 | 0 | n/a | n/a | n/a | 0 | 0 |
+
+## Cancel Latency
+
+- No cancel latency samples.
+
+## Reaction Decisions
+
+- Matched: 0 (n/a)
+- Skipped: 0 (n/a)
+
+### Skip Reasons
+
+| Reason | Count | Percent |
+| --- | ---: | ---: |
+| _none_ | 0 | 0.00% |
+