Run Configuration view: build parameters as CLI arguments #12

A webview view for build parameters, persisted per workspace and applied to local runs as --name value.

Implemented on feature/views-and-run-config (#2) — src/runConfig.ts (RunConfigStore, RunConfigViewProvider).

Behaviour

• Parameters live in workspaceState — per workspace, plain, no secrets.
• buildArgs() renders them as --name value, quoting values containing whitespace and escaping embedded quotes.
• The view is a form: add, edit inline, remove. Changes fire onDidChange, which re-posts state to the webview.

Webview hardening

Worth preserving through any refactor:

• CSP with a per-load nonce; default-src 'none', scripts only via the nonce.
• All DOM construction uses textContent / .value, never innerHTML with data — no injection path from a parameter name or value.

Related

The view is free-form: it shows only what you hand-type. Populating it from the build's own [Parameter] declarations is #1, blocked on Fallout#499 (still open — build-graph.json has no parameters[] yet).

Depends on #9.

Acceptance

• Parameters persist per workspace across reloads
• Values with spaces and quotes survive the round-trip into the terminal
• CSP nonce present; no innerHTML used for data