docs: reconcile number-entity count to five (add ramp_half_width) (#1)

The README What's-new callout and the CHANGELOG 2.1.0 entry still said four number entities, while the README table/intro and the runtime-range-controls spec say five (the four range bounds plus ramp_half_width). Update the callout to list all five and add a CHANGELOG entry for the fifth entity; leave the historical 2.1.0 'four' entry intact. Docs only -- code and spec already reflect five. Filed as openspec change fix-number-entity-count-docs.

openspec/changes/fix-number-entity-count-docs/.openspec.yaml

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+schema: spec-driven
+created: 2026-07-08

openspec/changes/fix-number-entity-count-docs/README.md

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+# fix-number-entity-count-docs
+
+Reconcile CHANGELOG and README to five number entities (adds ramp_half_width)

openspec/changes/fix-number-entity-count-docs/proposal.md

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+## Why
+
+The count of `number` entities per profile is inconsistent across the Adaptive Lighting docs. The integration exposes **five** live-tunable `number` entities per profile — the four range bounds (`min_brightness`, `max_brightness`, `min_color_temp`, `max_color_temp`) plus `ramp_half_width` — as stated in the README reference table ("Number entities (5)") and intro ("five live-tunable sliders"), and as required by the `runtime-range-controls` spec ("exposes five runtime curve entities"). But two doc locations still say four: the README's top callout block ("four live-tunable sliders", listing only the four range entities) and the `CHANGELOG.md` `2.1.0-cdit.1` "Added" entry, which introduced the original four and was never followed by an entry recording the fifth (`ramp_half_width`). A reader gets contradictory counts inside the same README.
+
+## What Changes
+
+- **README**: update the top callout block (the "four live-tunable sliders" section) to list all five entities, adding `number.<profile>_ramp_half_width`, so it matches the reference table and intro further down the same file.
+- **CHANGELOG**: add an entry under the appropriate unreleased version documenting the `ramp_half_width` number entity as the fifth live-tunable slider. Leave the historical `2.1.0-cdit.1` "four" entry intact — it accurately records the release that introduced the first four; the gap is the missing later entry, not a wrong historical one.
+- No source change: the implementation already creates five entities.
+- No spec change: `runtime-range-controls` already specifies five (its "four range entities" wording refers to the range subset, distinct from the ramp control).
+
+## Capabilities
+
+### New Capabilities
+
+None. Documentation-only correction.
+
+### Modified Capabilities
+
+None. `runtime-range-controls` already reflects five entities; behavior is unchanged.
+
+## Impact
+
+- `Adaptive_lighting/README.md` (top callout block) and `Adaptive_lighting/CHANGELOG.md` (one added entry). No source or spec files change.

openspec/changes/fix-number-entity-count-docs/tasks.md

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+# Tasks
+
+## 1. Reconcile the number-entity count across the docs
+
+- [x] 1.1 In `README.md`, update the top callout block that says "four live-tunable sliders" to list all five entities, adding `number.<profile>_ramp_half_width`
+- [x] 1.2 In `CHANGELOG.md`, add an entry under the current unreleased version documenting the `ramp_half_width` number entity as the fifth live-tunable slider; leave the historical `2.1.0-cdit.1` "four" entry unchanged
+- [x] 1.3 Verify the README intro ("five live-tunable sliders") and the reference table ("Number entities (5)") now agree with the corrected callout
+- [x] 1.4 Grep the repo for other stale "four ... number"/"four ... slider" doc references and fix any stragglers
+- [x] 1.5 Leave source and the `runtime-range-controls` spec untouched (both already reflect five entities)