[Karanvir1729]

What

The adversarial review of the 0.2.3 backport found four more ways page-controlled or misconfigured input could widen GenClass's behaviour. They are fixed in 0.2.3 (tag pushed, release waiting for approval) and main had the same code paths, so this ports them, line for line where the code matched:

1. Route rules. A routes[] rule now matches the raw location.pathname or its normalised form (percent-decoded in a try/catch, ; params stripped, dot segments and repeated slashes resolved, no trailing slash), so /se%61rch, /search/, //search and /search;x=1 can no longer step out of a rule that scopes /search to off or observe. scope.route stays raw. (util/match.ts normalizeRoute, runtime.ts computeScope.)
2. Invalid mode. Anything but observe, guard or heal now runs as observe with one warning, in the constructor and in readWindowConfig; modeAllows fails closed for anything but guard or heal. Before, an unknown value ran as heal.
3. Sample bucket. sample: 0 never reads sessionStorage; the bucket is stored as act@<sample> or observe@<sample> and reused only under the same sample, so a stored act cannot lift a sampled-out session.
4. Aggressiveness names. aggressivenessLevel checks names with includes, so "constructor" and other prototype names never yield a function.

Also: the draft security advisory docs/security/2026-10-mode-raise.md (the mode-raise issue plus these four, with affected versions checked per tag, a CVSS 3.1 vector with its reasoning, workarounds and a timeline; marked DRAFT for the owner to publish through GitHub's advisory form) and an Advisories line in SECURITY.md. Docs: OPTIONS-SPEC, API.md, THREAT-MODEL T8, INTERCEPTION.md, the runtime README, RESULTS.md section 10, and a CHANGELOG entry under Unreleased (0.3.0-beta.5) with a Security section. No version bump.

Tests

29 new or extended tests fail on main's sources and pass here (status-scope 14, options 13, gates 1, policy 1; 2 more pin unchanged behaviour). Full suite: 1,242 passed, 14 skipped (model parity). review-perf 4 of 4. tsc clean, tsup builds. No model-visible text changed; no review test edited.

Needs the owner's OK

• First-load limit. The fixes add 280 B gzip to /auto (108.63 KB), 33 B over bundle.test.ts's 108.6 KB ceiling, so the limit is raised to 108.7 KB in this PR, the way earlier branches did pending your OK. The alternative is trimming about 35 B of warning text, which would make 0.3.0's strings differ from 0.2.3's.
• Still stale after this PR and left alone (binding or out of scope): CONTRACT.md line 540, the README's ?genclass-sample=1 plus debug recipe, INTERCEPTION.md line 205; listed in the advisory's owner notes.

Not run: the browser and Playwright suites, smoke, the install suite and the visual bench (CI or ask-first).

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