odd/gate/transitions: add inflected forms for geminating verbs

[klappy]

Small canon follow-up surfaced during Phase 2 smoke testing of klappy/oddkit#gate-governance-source-envelope.

Observation: the Porter-style stemmer at workers/src/bm25.ts drops -ing and -ed suffixes but does not reverse consonant gemination. So shipping stems to shipp (not ship) and stepped stems to stepp (not step). The CHANGELOG and tool description I wrote for 0.20.0 claimed these forms work via stemming — they don't.

Fix via canon, not stemmer. Adding a handful of explicit inflections to the detection vocabulary is cheaper and more auditable than extending the stemmer, and keeps the adjustment editable at canon rather than at the code level. Non-geminating verbs (deploy, build, start, reconsider, etc.) still match their inflections via the stemmer alone — this PR only adds the forms that gemination blocks.

Changes:

• execution-to-completion row: ship, deploy, ... → ship, shipping, shipped, deploy, ...
• execution-to-exploration row: ... step back, reconsider → ... step back, stepped back, stepping back, reconsider
• Notes section rewritten to describe the stemmer's actual reach honestly and explain why these few inflections are listed explicitly.

Refs: klappy/oddkit Phase 2 branch gate/governance-source-envelope (PR pending after this merges and the matching MINIMAL_TRANSITIONS update lands).

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Note

Low Risk
Low risk: canon-only documentation/vocabulary tweak that broadens match phrases, with no code or data-handling changes.

Overview
Updates odd/gate/transitions.md detection vocabulary so execution-to-completion and execution-to-exploration also match geminated verb inflections (e.g., shipping/shipped, stepped back/stepping back) that the current stemmer doesn’t normalize.

Rewrites the Notes to accurately describe the stemmer’s limitations around doubled consonants and explicitly justifies listing these inflections in canon rather than changing the stemmer.

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