Consume deltic from JSR across conformance, demo, and wpt parity

[lann]

Follow-up to the ecosystem ruling in polymorph-iroh#45: every deltic consumption surface in this repo — the host module, the conformance leg (deno + browser), the demo, and the WPT parity carrier — moves from raw.githubusercontent URLs + the sha-pinned release-asset fetch to the JSR prereleases deltic publishes per green commit (0.1.0-pre.g<shorthash>, same hash as the GitHub release). Pin bump rides along: pre-58b2404 → ga67ee83 (~61 upstream commits; the consumed surface — embedder, runSuite, Translator.translate — is API-stable across it).

What this buys

• fetch-translator.ts (TAG + sha256 + assertPinConsistency) retires. Deno-side runners (conformance run.ts, examples/deltic-demo) load the translator through the module graph via @deltic/translator — permission-free; release-asset net grants disappear from every recipe. --translator survives as an optional dev override.
• Browser-side assets (conformance browser leg, WPT parity carrier, roundtrip/smoke drivers) are repo-built from the same pinned graph: the shared extract-deltic-translator recipe copies the packaged translator wasm out of the lock-pinned module cache into version-free target/deltic-browser/, and the @deltic/release-bundle-entry raw-URL alias is replaced by a local browser-bundle-entry.ts (upstream tools/release-bundle/entry.ts's exact surface). Worker protocol and the pinned @polymorph/component-test-js untouched.
• The pin story collapses to two deno.jsons (host module + conformance leg) carrying the same version + their --frozen locks; just exam-deltic (wired into gha::conformance-checks) asserts one jsr:@deltic/* version repo-wide — the successor to assertPinConsistency.
• minimumDependencyAge exempts jsr:@deltic/* per deltic's consumption README; everything else keeps Deno's default 24-hour supply-chain gate.

Discovered en route: Deno stores remote modules as body + a // denoCacheMetadata={…} trailer; copying a cached wasm asset wholesale yields a module that fails WebAssembly.compile in the page. The extraction script truncates to the graph-reported size and asserts wasm magic + trailer shape.

Not changed: worker protocol, @polymorph/component-test-js pin, Rust, WIT.

Gates (all green): just deltic-module-check 12/12; conformance-ct::run-deltic 55/55; conformance-ct::run-deltic-browser 55/55; demo::deltic 100/100 round-tripped; wpt::smoke ok; wpt::parity baseline 50/51 + round-trip 50/50, 0 known losses; wpt::parity-chromium 46/51 + 50/50 (exit 0); just exam-deltic; deno check --frozen across all changed graphs; leftover-reference grep clean.