The terminal moves into core/, shared with Prism (#15)

[Maxaubert]

Part of #15. Stacked on #17 (the drop fix): this PR's base is that branch, and GitHub retargets it to main when #17 merges.

What this is

The owner's decision (2026-09-19): Prism's terminal and Prism Terminal must stay in sync, and this repo is the core ("why can't this repo be the core?"). Everything that IS the terminal moves into core/, which Prism consumes. The first commits change no behaviour; the later ones apply the owner's decisions (below).

What moved into core/

• main: terminal, shells, termPrompt, agentDetect, agentPoll, agentResume (the generic half: claudeSessions, validResume; this app's planRestore stays in src/).
• renderer: TerminalPanel, TermFind, useAgentIndicator, agentTitle, agentClock, termActivity, termAnsi, termBus, termPaste, termPrefs, termLinks, termLinkPaint, termTheme, termLook, recentRoots.
• shared: termCwd, the terminal's types, and a single table of IPC channel names.
• The bridge to main, written once for both hosts: core/preload/api.ts (createTermApi) and core/main/ipc.ts (registerTermIpc). This app's preload and main now call them instead of carrying their own copies.

The host seam (core/renderer/host.ts)

Where the two apps legitimately differ, the core asks its host instead of forking: the default each untouched setting reads as, whether there is a host style to follow, who paints the ground, and which chords the app owns. Defaults are per host on purpose, so adopting the core never silently changes what an existing Prism user sees. This app's answers are in src/renderer/src/termHost.ts.

The core carries the superset

This app had DELETED capabilities only Prism uses (cdTerm, decideFollow, cdCommand, following the host's style). As the core, deleting them here would take them from Prism, so Prism's fuller versions are back, unused by this app. It also takes Prism's newer termPaste (a copied image FILE pastes as its path), which this app never got: exactly the drift this ends.

Guard rails

• Lint wall on core/, proven to bite: no path aliases (a consumer resolves @shared against ITS OWN tree; measured, silently, no error), no window.prism (use termApi()), no host src/, no electron, no chromeTheme (inside Prism it would overwrite the app's styles).
• Seam tests model both hosts and prove an untouched setting reads as its own host says.
• core/README.md is the contract; CLAUDE.md's "copied, port by hand" paragraph, which the owner reversed, is replaced by it.

How Prism consumes it

core/ is published on its own as the core-dist branch (git subtree split --prefix=core), so the package is small, scriptless and carries no app files. Tagged core-v0.1.0-rc.1. Checked: npm fetches 29 files, 164 KB, tests excluded. Prism's first adoption step is Maxaubert/Prism (see the linked PR), where the full e2e passes on it.

The owner's decisions, applied here (2026-09-19)

• The terminal's SETTINGS are the core's too (core/renderer/settings): same names, types and behaviour in both apps, values per app. settings/options.ts lists every option; a unit test ties the list to the sections, and each app's e2e (options here, termOptions in Prism) asserts its page shows that list.
• The close question is one smart rule, not a setting (agentClose): a plain shell closes unasked, a tab hosting an agent asks, the window is held only while one is mid-answer. The on/off switch is gone.
• Ctrl+W closes a tab (Ctrl+Shift+W still works), in both apps.
• Host seam grew two declared fields: what an unpicked indicator colour resolves to, and what "acrylic" means as a terminal setting (Prism: the style owns the glass, no opacity slider).

How far Prism is

Three stacked drafts: Maxaubert/Prism#155 (identical files), #156 (panel, look stores, bridge), #157 (settings, indicator rules, close question, and the npm run e2e:terminal gate the owner asked for). Prism pins core-v0.1.0-rc.5; after this merges a real core-v0.1.0 is cut from main and Prism is repointed.

Verification

• npm run typecheck: clean. npm run lint: 0 errors.
• npm test: 369 pass.
• npm run e2e: all 14 scenarios pass with the app running on the core.
• Packaged and installed on this machine (exe timestamp polled until it moved), 2026-09-19 14:14.
• Prism on this core: typecheck, lint, 1474 unit tests, its terminal gate and its full e2e all pass (see Sort terminal themes: neutrals black to white, then coloured themes #157).

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