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CANP-WP-0005: document and detect inclusion diamonds

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Section 10.4 said nothing about inclusion being textual and repeated, so an
author met the behaviour only by reading rendered output carefully. That
silence was the defect.

Writing it up got the mechanism wrong at first. I documented a dependency
"reached by two paths" through two include chains, and wrote a detector that
counted composer calls to match. Tested it against the real case that motivated
the task — helix/repo-advance — and it did not fire, though the conventions
block still rendered twice.

The actual mechanism is subtler. helix/commit-sync declares its own
`conventions` input; when composed, resolution passes the including package's
already-resolved values down by name, so it *inherits* the outer text rather
than resolving its own include, and renders it again. Nothing was included
twice; the text appeared twice regardless.

Both mechanisms are now documented with worked diagrams. duplicate_inclusions
detects both — included values that are equal, and an included value contained
within another — and resolve, render and eval warn.

Nothing is deduplicated, as leaned. Deduplicating means choosing which
occurrence survives, since position in a prompt carries meaning, and deciding
what happens when two paths select different versions of the same dependency,
which section 10.3 permits. That is resolver behaviour and section 10.4 keeps
composition declarative.

Verified by reintroducing the diamond in a scratch copy of repo-advance, which
warns, and confirming the shipped factored collection stays silent.
Tests 90 -> 95.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bjefh8NUiEiahN4JLwoSKM

Assistant: claude-code
Assistant-Model: opus
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Assistant-Session: 3507023f-e0fd-4a1e-9d90-a0d4217d1502
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tegwick 2026-09-06 19:23:16 +02:00
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reference/README.md
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@ -79,6 +79,10 @@ rather than resolved by guessing.
print qualified `<registry>:<id>` references.
- `include` defaults are satisfied (inclusion is deterministic); `derive`
defaults are reported, not run. Inclusion cycles are detected and named.
- `resolve`, `render` and `eval` warn when an included value will render more
than once — two inputs including the same thing, or an included package
inheriting an outer input of the same name. Nothing is deduplicated; the fix
is a better factoring.
- `eval` runs the deterministic render checks of any eval declaring the
`canned-prompts/eval-rubric/v0.1` schema, and reports output criteria as
declared but not run. Unrecognized schemas are skipped, not rejected. A