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repl: portal save/resume — vault-backed tier checkpoints

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Adds a portal-bar to the REPL between tabbar and transcript: a save
button + chip strip showing all saved checkpoints for the active tab.
Click a chip to restore, click × to delete.

Per-tier strategy:
  * c, python — call the tier's (portal-snapshot! NAME), then read the
    JSON blob out of MEMFS (Emscripten/Pyodide FS) and stash it in the
    encrypted vault entry. Restore reverses: hydrate MEMFS, then
    (portal-load! NAME) merges the bindings into the live env.
  * asm — no portal serializer in the WAT tier yet (would need a
    Cheney-aware walk). Falls back to transcript replay: save snapshots
    every successful prior input, restore reboots the tier and re-evals
    them in order.

Plumbing:
  * Worker bridge: new portal-save / portal-load message kinds wire
    MEMFS reads/writes to the main thread.
  * runner.js exposes portalSave / portalLoad — null when a tier
    hasn't implemented portals (asm stays grey).
  * C tier: replace EM_JS with extern + --js-library for js_lumbda_bend_call
    (EM_JS-generated declaration was unreachable from wasmImports at
    instantiate time, browsers threw "import object field ... not a
    Function"). FS added to EXPORTED_RUNTIME_METHODS so JS can reach
    pyodide.FS / Module.FS for MEMFS I/O.

Smoke-tested all three tiers headlessly: save → chip render → restore
round-trips clean on c / python / asm, zero console errors.
This commit is contained in:
russell@unturf.com 2026-06-15 07:43:07 -04:00
parent f528d6df43
commit d4380c64c7
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19 changed files with 776 additions and 62 deletions
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