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Codeman can now be mounted under a sub-path behind a reverse proxy that forwards the prefix unchanged (e.g. https://host/codeman/). Default is `/` (root), which is byte-identical to the historical behavior. Design — few choke points, mirrored ingress/egress: - src/config/base-path.ts: pure single-source normalize/validate/join/strip. - Server ingress: stripBasePath() inside Fastify rewriteUrl, so routes stay declared prefix-agnostic; un-prefixed requests (hooks, health, docker bridge hitting the raw port) pass through unchanged. - Server egress: one onSend hook prepends the base to root-absolute Location headers (covers all redirects). - HTML: renderIndexHtml points <base href> at the mount and injects window.__CODEMAN_BASE__ — ONLY when a base is set (inert at root). - Frontend runtime URLs: CodemanBase.url() route builder in constants.js, applied transparently by a fetch wrapper and explicitly at the EventSource/WebSocket/window.open/<img|iframe|a>-src sites. - sw.js derives its base from self.location; manifest uses relative start_url/scope. - Web-tab proxy: proxyPrefixFor(cap, basePath) is the single base-aware root that cascades to the injected <base>, HTML/attr rewrites, runtimeUrlShim, Set-Cookie Path and Location; capabilityFromReferer strips the base off the browser Referer, while the ingress parsers stay base-agnostic (rewriteUrl already stripped it). --base-url rides the daemon relaunch (buildWebArgs) and the service unit (resolveServicePlan). constants.js is guarded against a missing `window` for isolated unit-test contexts. Tests: test/base-path.test.ts (pure helpers), base-path coverage in webview-proxy/render-index-html/daemon-control; CodemanBase stubbed in the vm-isolated panels-ui test contexts. Docs: Remote-Access.md (sub-path section + nginx example), security-architecture.md env table, CLAUDE.md pattern. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01XUkPBxbumnct6qSrx4JDju