feat: support project aware logging in runtime

[nborges-aws]

Description

Adds project-scoped Runtime logging commands.

agentcore project log runtime
agentcore project log runtime --name FooRuntime --target production
agentcore project log runtime --name FooRuntime --since 1h --level error

The command resolves a runtime from the current project into its deployed id and target region. The rest is delegated to the existing observability log search/tail implementation. Projects with only one configured runtime can omit --name; projects with multiple runtimes are required to select one explicitly.

This PR also makes the following updates to observability:

• Generalize the shared logs handler to support both imperative and project commands
• Move runtime log-group derivation into core/observability (previous lived in runtime directory)
• Moves CoreObservabilityClient from runtime handler types into observability
• Generalize project resource selection for reuse by invoke and logging commands.
• Remove the legacy observability client
• updates documentation with project commands

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other (please describe):

Testing

How have you tested the change?

• bun run test (3169 pass, 0 fail)
• I ran npm run test:unit and npm run test:integ
• I ran npm run typecheck
• I ran npm run lint
• If I modified src/assets/, I ran npm run test:update-snapshots and committed the updated snapshots

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

---

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[agentcore-devx-automation]

Claude Security Review: no high-confidence findings. (run)

[agentcore-devx-automation]

AgentCore Harness Review

Verdict: Looks good

Clean refactor + feature. Highlights I checked:

• src/core/observability.ts is split into observability/{runtime,insights,client,traces,types}.ts, and the old ObservabilityClient.resolveDeployedRuntime + handlers/runtime/resolveRuntimeTarget.ts are deleted with no remaining callers (git grep resolveDeployedRuntime|resolveRuntimeTarget|DeployedRuntime on pr2271 is empty). The CoreObservabilityClient interface moved to core/observability/types.ts and is re-exported from core/observability/index.ts, and TestObservabilityClient was trimmed to match — no dangling references.
• The deleted observability.test.ts coverage is preserved: runInsightsQuery and sanitizeQueryValue in core/observability/insights.test.ts, runtimeLogGroup in core/observability/runtime.test.ts, and listTraces/getTrace behavior via handlers/runtime/traces/traces.test.tsx.
• project log runtime uses the same projectManager.resolveDeployedResource seam as project invoke, and pins the region off the resolved target rather than the ambient one. selectProjectResource was extended with an operation string and moved up to handlers/project/selection.ts, and both invoke callers pass "invoke" — no stale imports.
• The new handlers/project/log/runtime.test.tsx sticks to the recommended pattern (real tempdir + ProjectSpecSchema.parse + fake ProjectBackend at the domain seam, no fs mocks). Telemetry is emitted by the router's cli.command_run for all commands, so the new subtree is instrumented automatically.

Nothing needs to change before merge.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.64865% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.93%. Comparing base (9d8cdbd) to head (b8b8877).

Files with missing lines	Patch %	Lines
src/handlers/project/selection.ts	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           refactor    #2271      +/-   ##
============================================
- Coverage     97.04%   96.93%   -0.12%     
============================================
  Files           566      567       +1     
  Lines         39353    39231     -122     
============================================
- Hits          38190    38027     -163     
- Misses         1163     1204      +41     

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[agentcore-devx-automation]

Claude Security Review: no high-confidence findings. (run)