Mechanical consistency sweep across the packages

[btravers]

From the 2026-08-13 repo audit. One sweep of small, mechanical consistency fixes across the packages — none changes behaviour, together they keep the "same patterns everywhere" promise honest.

• test:types script + tsconfig.test-d.json exist only in packages/start and packages/start-amqp; start-http and start-temporal have neither, while turbo.json defines a test:types task two of the three runtimes never register. Align (add the harness to http/temporal, even if empty of files today).
• Root CLAUDE.md still says "examples/ stays the only place the gate is pinned by a type test — start-http ships no *.test-d.ts", predating packages/start-amqp/src/amqp-runtime.test-d.ts. Update the sentence — this is the exact doc-drift the file warns about.
• The runtime: literal in RuntimeStartFailed construction is hand-duplicated in all three runtimes rather than derived from Runtime.name; http constructs inline (http-runtime.ts:139) while temporal/amqp share an identical startFailed helper (temporal-runtime.ts:67-68, amqp-runtime.ts:62-63). Pick one shape.
• traceId fallback idiom: http omits the key when the inbound header is blank (kernel default applies); amqp writes inbound ?? id explicitly (message-units.ts:82-89) — same semantics, two idioms. Pick one.
• UnitMeta.kind naming: http uses the protocol ("http"), temporal/amqp use the work noun ("activity", "delivery"). Decide the convention and record it.
• @temporalio/common is a peer dependency for a single type-only import (import type { Duration }, temporal-runtime.ts:8), while the same package declares ActivityMiddleware structurally precisely to avoid peering @temporal-contract/contract. Apply the structural rule to Duration too, or state why not.
• knip.json's workspaces block is dead config — knip's default entry patterns already cover src/main.ts (verified: knip passes with the block removed; examples/order-amqp was never listed and nothing broke). Delete it.