fix(error-reporting): silence ContextError to stop crash reports (CLI-3B)

[BYK]

Summary

ContextError is thrown when the user omits a required value — no
org/project could be auto-detected, a required ID was not provided, etc. It is
an expected user-input error (per AGENTS.md: "User omitted a required value →
ContextError"), yet it was still reported to Sentry as an unhandled crash.

That made it the single highest-volume issue in the project:

Issue	Title	Users	Events
CLI-3B	Could not auto-detect organization and project	1985	9003
CLI-CG	Event ID is required	619	1618
CLI-1BC	Specific project is required	133	291
CLI-1BD	Span ID is required	90	194

Fix

Classify ContextError as silenced in classifySilenced, mirroring the
existing OutputError / expected-AuthError / 401–499 ApiError rules:

• Volume is preserved via the cli.error.silenced metric, now enriched with the
  ContextError.resource so the missing value (e.g. "Organization and project" vs "Event ID") keeps sub-grouping context. resource values are a
  small fixed set, so metric cardinality stays low.
• Silenced errors also no longer mark the session as crashed, so missing-input
  errors stop skewing release-health.

Why the whole class (vs. opt-in like ResolutionError)

ContextError always means "you didn't provide X" — there is nothing
per-instance to investigate. This differs from ResolutionError, where a
provided value that can't be matched may signal a product/access issue worth
observing (which is why that class is silenced opt-in). The cli.error.silenced
metric still records the volume and which value was missing.

Test plan

• classifySilenced tests updated: ContextError now asserts "context_missing"
  (removed from the "does NOT silence" list).
• reportCliError integration: ContextError now asserts no captureException
  • a cli.error.silenced metric carrying error_class, reason, resource.
• telemetry test updated: ContextError is silenced and does not mark the
  session crashed.
• vitest run test/lib/error-reporting.test.ts test/lib/telemetry.test.ts → 183 passed
• property + session telemetry suites → 65 passed
• biome check clean on changed files

Fixes CLI-3B

[github-actions]

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Codecov Results 📊

✅ Patch coverage is 100.00%. Project has 5133 uncovered lines.
❌ Project coverage is 81.46%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    81.53%    81.46%    -0.07%
==========================================
  Files          397       397         —
  Lines        27682     27686        +4
  Branches     17968     17972        +4
==========================================
+ Hits         22570     22553       -17
- Misses        5112      5133       +21
- Partials      1867      1861        -6

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