feat(observability): expose scoped construction operation timings

[DecisionNerd]

The ordinary host construction receipts recorded whole-ingest wall time but omitted the append, seal and resumed-construction durations required by #901. Import validation and commit now expose per-invocation wall-time observations for construction begin, resume, append, seal and publication, with attempted-call and error counts.

Timing state resets before each operation, records returned errors and stays out of durable manifests. Successful CLI receipts expose the closed numeric object; the existing certifier preserves it and rejects malformed counters or extra fields. Documentation distinguishes these scopes from durable phase I/O, CPU and whole-ingest time, including work that failed commands or lost processes cannot report.

Direct regressions cover repeated validation, persisted manifests, cancelled publication and successful retry with an immediate same-facade relationship query, plus separate-process CLI validate/commit/status receipts. The existing tiny/growth lifecycle also asserts that actual CLI receipts retain the expected timings through the certifier. The new accessor is included in the public method inventory with its direct regression and explicitly classified as a Rust/CLI diagnostic in Python and Node parity inventories.

Validation:

• Full API library: 739 passed; 118 BDD scenarios and preceding integration/CLI suites passed.
• Direct timing/cancellation regression and separate-process CLI receipt regression: passed.
• Certifier tests: 28 passed; schema smoke: 8 passed; public surface policy: 12 passed; binding parity policy: passed; gate registry: 14 passed.
• Workspace and certifier Clippy, formatting, fast checks and changed Python Ruff checks: passed.
• Existing tiny lifecycle using frozen CLI/certifier/generator: all 10 phases passed, expected timing call counts preserved, executable hashes unchanged.
• Full make pre-push stopped only at existing test(storage): respect native TMPDIR in socket inventory regression #1192: the hardcoded-/tmp socket fixture receives GF_UNSUPPORTED_FILESYSTEM (storage 1,097 passed, 1 failed, 2 existing ignored). Later local stages were not reached; no full local gate pass is claimed.

Closes #1256.

[coderabbitai]

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