…#1073)

* docs(notice): rename NOTICE.md -> NOTICE; add CLA third-party section

Two changes, one file rename:

1. Rename NOTICE.md -> NOTICE, matching the Apache / CNCF convention used
   by upstream third-party-attribution files (kubernetes-sigs/kro,
   kubernetes-sigs/headlamp, etc.). The .md extension was non-idiomatic
   for a generated legal artifact -- NOTICE files are read by tooling
   (license scanners, SBOM generators) that match on the bare filename.
   Generator (scripts/generate-notice.py), Makefile target, and the
   NOTICE Drift Check workflow are all updated to operate on the
   extension-less path.

2. Add a 'Submitted on behalf of a third-party' section to NOTICE,
   crediting five contributors whose pull requests landed before the
   microsoft-github-policy-service CLA bot recorded a signature on
   file. The repo transferred from danielmeppiel/awd-cli to the
   microsoft org; some early PRs predate CLA enforcement, and we
   could not retroactively reach all contributors. Mirrors section 7
   of common CLA texts (the wording adopted by CNCF NOTICE files).

   Driven by a new _third_party_submissions block in
   scripts/notice-metadata.yaml -- legally-significant wording stays
   alongside the per-component data, not buried in code.

   Contributors named (verified via Check Runs API against the
   microsoft-github-policy-service app, license/cla check on every
   merged PR by each suspected author):
     - @pofallon  (PR #4)
     - @richgo    (PRs #8, #25, #26, #33, #34)
     - @ryanfk    (PR #92 -- bot ran with conclusion=null,
                  output: 'Contributor License Agreement is not agreed yet.')
     - @foutoucour (PR #108)
     - @Jah-yee   (PR #184)

   Listed contributors who later sign the CLA (or who were signed
   under a different GitHub account at the time) can request removal
   via issue.

Co-authored-by: Copilot <[email protected]>

* docs(notice): trim third-party section preamble

Strip the historical/CNCF-citation paragraph and the verbatim CLA-section-7
quote. Keep only the active sentence (what the listing means + how to
request removal).

Co-authored-by: Copilot <[email protected]>

* docs(notice): address PR #1073 review

Three fixes from copilot-pull-request-reviewer:

1. Drop spurious leading '---' separator in the third-party-submissions
   renderer. render_component already ends each component with '---\n\n',
   so prepending another '---' produced two consecutive separators in
   NOTICE. Verified: separator count dropped from 17 to 16.

2. Sweep stale 'NOTICE.md' references in scripts/generate-notice.py
   (top-level docstring, Modes section, ComponentMeta and DepSpec field
   docstrings). The constant was renamed; the docs lagged.

3. Append (#1073) PR refs to both CHANGELOG entries; ASCII-correct the
   arrow ('->' instead of '->').

Co-authored-by: Copilot <[email protected]>

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Co-authored-by: Copilot <[email protected]>
Co-authored-by: Copilot <[email protected]>