Retire "declaring spec" from functional-spec prose in favour of "declaration"

[vjovanov]

What is missing

The functional spec still says declaring spec where §FS-terms.terms.1 says declaration. Sweep it, in one pull request that answers for this word and for nothing else.

• Row: §FS-terms.terms.1 — "declaration — A heading or doc-comment line that introduces an ID. Its body is the fact. Displaces spec, fact and declaring spec."
• Size: 1 occurrences across 1 functional-spec file(s), 0 of them in a heading title. Measured at 4b2b647aaa. The raw grep -c is 2 and is not the number to plan from. Per file: FS-examples.md (1).
• Carve-outs: One occurrence. The bare word spec is bucket C and is not part of this issue — rewrite the compound only.
• Heading titles this renames: None. No heading title carries the word, so no anchor moves and no link fragment is invalidated by this change.
• Also in scope: whatever this change breaks, wherever it lives, including README.md (§FS-examples.4 → §REQ-readme.2). Prose in docs/architecture/, in a released changelog under docs/changelog/, and in the frozen GOAL, REQ and decision-record texts is not — those keep the words they have (§FS-terms, FS-terms.md:38-45); grund fmt --write still repairs their link fragments.
• Claims: this word and nothing else. It makes no claim about any other retired word, and certifying the completeness of unchanged prose beyond it is not part of the review (§FS-terms, FS-terms.md:62-64).
• Bucket: A — mechanical: a distinctive compound with no competing sense. A sed and a reading pass.

Why it belongs in this tool

§FS-terms is grund's own specification of what its words mean, and a grund spec that uses a word it retired is the drift that declaration exists to close. FS-terms.md:38-45 says a commissioned pass is a permitted way to pay this debt and that it answers for the words it names — this is one such pass, for one word.

Two things a reviewer should not mistake. grund check exits 0 over every stale link fragment a heading rename leaves behind — an anchor is not a coordinate — so "grund check is green, therefore nothing broke" is wrong here. grund fmt --check names them, --write repairs them, and lychee reports Cannot find fragment independently. And a raw grep -c overstates this sweep by roughly 3× overall (37× on ref), which is why the size above is the measured residual.

What you do today instead

Nothing: the word is retired on paper and stands in the prose. A reader who takes the cheap lead read of a section gets a word the shared vocabulary says is not the word, and has to open FS-terms to find that out — the second file §GOAL-token-economy.1 charges for, and the exact failure §FS-terms says it exists to close.

Worked example: PR #306 (point size → coordinate-size: 11 files, +20/−18, including the heading rename, the nine fragment repairs and README.md). Parent: #291.