The brief carries broken and stale intra-record cross-references invisible to links_resolve (which strips the #fragment before resolving): six deep links name headings that were renamed or renumbered (04-launch.md, 04-universal-patterns.md, 01-ahoy.md, 05-intent.md sections 5/6/7), ten anchors mis-encode an em dash, 00-meta.md cites a deleted disembark section-3 budget rule, and three live README lines cite the pre-split monolithic brief by section number

The brief carries broken and stale intra-record cross-references invisible to links_resolve (which strips the #fragment before resolving): six deep links name headings that were renamed or renumbered (04-launch.md, 04-universal-patterns.md, 01-ahoy.md, 05-intent.md sections 5/6/7), ten anchors mis-encode an em dash, 00-meta.md cites a deleted disembark section-3 budget rule, and three live README lines cite the pre-split monolithic brief by section number

Evidence

Root cause: internal/core/lint/lint.go checkLinks strips the #…? fragment before resolving and skips same-file # links, so links_resolve never validates anchors even though it is a blocking rule (tracked separately as the systemic gap).

Broken/stale references (all in .abcd/development/):

• brief/05-internals/06-lint.md cites 05-intent.md § 5 #5-acceptance-gates…; that heading is now ## 6. (§ 5 is "Frontmatter fields").
• brief/05-internals/{03-configuration,04-universal-patterns,09-provenance-substrate}.md → 04-launch.md#2-payload-manifest-default-deny; heading is now ## 2. Curated release artefact (default-deny).
• brief/05-internals/05-prompt-quality.md → 04-universal-patterns.md#2-mcp-preferred-…; heading is now ## 2. Host-delegated by default, oracle adapters opt-in.
• brief/01-product/01-press-release.md → 01-ahoy.md#1-acceptance (heading is unnumbered ## Acceptance); intents/disciplines/itd-1-acceptance-gates.md → 05-intent.md#7-the-intent-fidelity-reviewer-agent… (renamed intent-auditor).
• Ten anchors mis-encode an em dash (single hyphen where the slug needs --): the 03-embark.md#7-voyage-layout — … and 03-mental-model.md#the-naurian-gap — … targets.
• brief/00-meta.md cites 02-disembark.md § 3 #3-agent-context-budget; that section (and the word "budget") no longer exists in the target — the rule now lives in 05-internals/03-configuration.md (maxAgentTokens).
• Three live READMEs cite the pre-split monolithic brief by section number (roadmap/rfcs/README.md "§ 11" and "§ 5"; intents/README.md "§ 1.5" — now the four-layer model in 01-product/03-mental-model.md).

Adversarial review

CONFIRMED (substantive + nitpick sites) by two independent refuters, which supplied the exact corrected slugs and confirmed the frozen planned/, plans/, research/ bodies are accepted-as-historical and left untouched. Fix: repoint each anchor/citation; leave frozen records alone.