feat(monitor): port Monitor V2 commands from Go CLI

[beengud]

Closes #6

Ported surface — observe monitor

Command	GraphQL op	Output
monitor list [<name-substring>]	searchMonitorV2	table/json/csv (id, name, disabled, updatedDate)
monitor get <id>	monitorV2	human summary + full definition (json/csv for raw)
monitor preview-query <file.json>	evaluateMonitorV2Source	compiled OPAL pipeline (per-stage) + output stage
monitor preview [--workspace <id>] [--since <dur>] <file.json>	previewMonitorV2	"Would fire: true/false" + sample alarm groupings
monitor alarms [--workspace] [--monitor-id] [--since] [--level]	searchMonitorV2Alarms	table/json/csv (id, monitorId, level, status, startTime, endTime)

Input JSON is MonitorV2Input (min: name, ruleKind, definition). All commands support --format json|csv.

Field-name corrections vs the Go CLI (the Go queries were written against an older schema)

The published SDL (terraform-provider-observe) differs substantially from the Go fork's hand-written queries. Corrections made to match the authoritative schema:

• searchMonitorV2 / searchMonitorV2Alarms return results, not monitors / alarms.
• previewMonitorV2 requires a params: QueryParams! arg (Go omitted it) and returns MonitorV2Preview { alarms, stabilityBookmarkTime, alertSchema } — there is no wouldFire / samples. "Would fire" is derived as alarms.length > 0; groupings come from each alarm's context / capturedValues.
• searchMonitorV2Alarms args are monitorIds: [ObjectId!], minTime/maxTime (Go used monitorId, startTime/endTime). MonitorV2Alarm has no monitorId/status — monitorId comes from monitor { id } and status is derived from isActive (Active/Ended).
• evaluateMonitorV2Source returns MonitorV2SourceEvaluation { query: MultiStageQuery! } — there is no pipeline / resultSchema; the OPAL is in query.stages[].pipeline.
• searchMonitorV2/previewMonitorV2/searchMonitorV2Alarms take workspaceId: ObjectId (nullable) → exposed via optional --workspace (the new CLI Config has no workspace).
• MonitorV2AlarmLevel enum values are capitalized (Critical/Error/Warning/Informational); --level accepts lowercase and normalizes.

monitor get renders a human summary by default (no yaml dependency in the repo); --format json emits the full monitor incl. definition.

Verification

• Codegen: scoped graphql-code-generator against the published SDL ends ✔ Generate — all five operations validate against the schema with zero document errors.
• Typecheck: scoped tsc --noEmit is clean for src/commands/monitor and src/gql/monitor (only unrelated bun:test/other-resource noise outside the feature).
• Tests: bun test src/commands/monitor/ → 18 pass / 0 fail across 5 files.

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