Two independent bugs made transcript pages silently fail to reach the brain.
1. Frontmatter fence gluing. buildTranscriptPage() built the closing "---"
with no trailing newline, and session bodies always start with "## ", so
the rendered page ended "...---## User". gbrain's frontmatter matcher
(/^---\r?\n([\s\S]*?)\r?\n---(\r?\n|$)/ in src/core/markdown.ts) requires
the closing "---" to end its own line, so it skipped the glued fence,
latched onto the next standalone "---" in the transcript body, parsed the
prose between as YAML, and dropped the page with "Invalid YAML frontmatter".
Transcripts with no later "---" fell back to body-only, silently losing
their frontmatter. Fix: emit the fence on its own line with a blank
separator, matching renderPageBody()'s artifact branch.
2. Slug collisions. Two source files can map to one path-derived slug (a
session resumed under the same id on one day, or two ids sharing a 12-char
prefix). writeStaged() names each file "${slug}.md", so the second
overwrote the first; gbrain collected N-1 of N staged files and the
reconciliation guard failed the whole batch every run. Fix:
disambiguateSlugs() keeps the first occurrence and gives each later collider
a stable "-<sha8(source_path)>" suffix (deterministic, and slug + page_slug
move together so writeStaged, the failure mapping, and state recording agree).
Exports buildTranscriptPage, renderPageBody, and disambiguateSlugs for tests.
Adds regression tests for both failures.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Wave-amended: contributor's local-workaround docblock note removed; issue refs retargeted #2653 (closed by its author) -> #2724 (the live 887-staged-to-0-ingested report)
