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3d1f4fda53 #188: purpose-bound token keys via HKDF, jose replaces the homegrown JWT
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COLLAB_TOKEN_SECRET becomes a root key: every purpose derives its own
HKDF-SHA-256 subkey (deriveTokenKey), and no code path signs with the
root key directly. Collaboration tokens are signed and verified by jose
with HS256 as an explicit allowlist; the sign/verify API turns async at
its three call sites. Unsubscribe tokens move from a purpose-prefix
string to the structural subkey, with a documented dual-verify window
(legacy derivation accepted until 2026-11-01, covering the 90-day TTL
of links in already-sent mail).

The cross-runtime property that justified the homegrown implementation
is now proven by a test: the built CJS and ESM dist artefacts round-trip
tokens in both directions in child processes (jose v6 reaches CJS via
Node's require(esm), pinned Node 22 images). Negative tests cover
cross-purpose subkeys, root-key-signed tokens, alg:none and RS256.

Refs #188 (ADR 0020)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0168Ph5uBmHm8X28CSVpbpnJ
2026-07-30 06:41:11 +02:00
3e377aaa57 #226: add the §52 VSA delimitation statement
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Reviewer-facing document derived from ADR 0019: per base function
(encryption, media protection, network termination, authentication,
integrity) what the application does, what it deliberately does not,
and which party provides it — every claim traceable to code via the
ist-aufnahme. Includes the operator-duty handover (with the IndexedDB
endpoint copy named explicitly, I-25) and the delta list mapping every
divergence from the target state to its closing issue.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0168Ph5uBmHm8X28CSVpbpnJ
2026-07-30 06:29:05 +02:00
fd07f716f6 docs: VS-NfD readiness planning (ist-aufnahme, plan, ADRs 0019-0026, issue drafts)
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Add docs/vs-nfd/: the analysis brief, the as-is assessment (42 findings,
all verified against the code), the prioritized action plan rev. 2 with
issue references written back to every checkbox, the two-stage issue/ADR
brief, and the full reviewed draft used to create the forge state.

Add eight proposed ADRs 0019-0026 covering the VS-NfD architecture
decisions: no security base functions (par. 52 VSA anchor), HKDF token
key separation, external authentication, page classification, read-access
audit trail (variant A), reproducible offline deployment, plugin trust
model, and backup target restriction.

Forge state created alongside this commit: 11 labels, milestones M24-M31,
issues #188-#236 (docs-only change, no code touched).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0168Ph5uBmHm8X28CSVpbpnJ
2026-07-30 01:48:05 +02:00