fix(yaml_io): validate line-1 delimiter before parsing Markdown frontmatter (#2663) - #2666

Merged

Daniel Meppiel (danielmeppiel) merged 28 commits into

microsoft:mainfrom

manideep-malyala:fix/frontmatter-horizontal-rule-parsing

Sep 2, 2026

Commits on Aug 25, 2026

fix(yaml_io): line-1 check for YAML frontmatter to prevent misinterpreting middle horizontal rules

Manideep Malyala (manideep-malyala)
authored and
Daniel Meppiel (danielmeppiel)
committed
499d233
fix(yaml_io): address PR review comments (explicit line-1 fence check and clean unused imports)

Manideep Malyala (manideep-malyala)
authored and
Daniel Meppiel (danielmeppiel)
committed
2b9a4e5
fix: align frontmatter fence detection

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
2df7154
test: patch frontmatter at consumer boundaries

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
778e5ea
test: guard frontmatter parser authority

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
32046c9
test: harden frontmatter authority boundary

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
1f7555c
chore: refresh architecture instruction hash

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
f15b592
fix: centralize instruction frontmatter conversion

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
8d04fe9
chore: document internal parser consolidation

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
18cb425
fix: fail closed in instruction conversion

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
afd4a77
fix: make instruction rejection atomic

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
7234e26
fix: preflight instructions across targets

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
e850682
fix: reject invalid instructions before package writes

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
5dbe09f
docs: distinguish invalid fenced frontmatter

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
11d0c93
chore: preserve lint after rebase

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
60a3524

Commits on Sep 2, 2026

fix: make instruction preflight authoritative

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
9c57a93
Merge origin/main into fix/frontmatter-horizontal-rule-parsing

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
235f877
test: bind frontmatter owner rule to repository

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
0ef22f1
fix: preserve BOM detection after convergence

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
2e14577
fix: close prepared instruction bypasses

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
e2fcc88
refactor: extract target path summary formatting

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
33dd3c9
docs: keep frontmatter release notes current

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
2ce504c
fix: scan decoded surrogate pairs before deployment

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
ba16a65
perf: skip surrogate rebuilding on common text

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
d44e837
fix: make decoded frontmatter recovery actionable

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
801b736
fix: surface decoded frontmatter recovery guidance

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
cf0cdf5
fix: preflight before target reconciliation writes

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
9256b62
test: prove failed updates preserve hook state

Daniel Meppiel (danielmeppiel)
and
Copilot
committed
ae0359a

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fix(yaml_io): validate line-1 delimiter before parsing Markdown frontmatter (#2663) - #2666

fix(yaml_io): validate line-1 delimiter before parsing Markdown frontmatter (#2663)#2666
Daniel Meppiel (danielmeppiel) merged 28 commits into
microsoft:mainfrom
manideep-malyala:fix/frontmatter-horizontal-rule-parsing

Commits on Aug 25, 2026

fix(yaml_io): line-1 check for YAML frontmatter to prevent misinterpreting middle horizontal rules

fix(yaml_io): address PR review comments (explicit line-1 fence check and clean unused imports)

fix: align frontmatter fence detection

test: patch frontmatter at consumer boundaries

test: guard frontmatter parser authority

test: harden frontmatter authority boundary

chore: refresh architecture instruction hash

fix: centralize instruction frontmatter conversion

chore: document internal parser consolidation

fix: fail closed in instruction conversion

fix: make instruction rejection atomic

fix: preflight instructions across targets

fix: reject invalid instructions before package writes

docs: distinguish invalid fenced frontmatter

chore: preserve lint after rebase

Commits on Sep 2, 2026

fix: make instruction preflight authoritative

Merge origin/main into fix/frontmatter-horizontal-rule-parsing

test: bind frontmatter owner rule to repository

fix: preserve BOM detection after convergence

fix: close prepared instruction bypasses

refactor: extract target path summary formatting

docs: keep frontmatter release notes current

fix: scan decoded surrogate pairs before deployment

perf: skip surrogate rebuilding on common text

fix: make decoded frontmatter recovery actionable

fix: surface decoded frontmatter recovery guidance

fix: preflight before target reconciliation writes

test: prove failed updates preserve hook state