Fix SSI coffee transformer validity

[chubes4]

Summary

• normalize PHP transformer block support serialization so generated markup validates in the editor
• improve navigation submenu conversion, RichText anchor/SVG handling, runtime-island metadata, and typography font-family analysis
• add/update contract, unit, and parity fixture coverage for the SSI coffee fixture regressions

Verification

• composer test from php-transformer
• SSI one-fixture Lab run ssi-onepager-coffee-integrated-20260703e
• Lab result: failed_fixture_count=0, editor_invalid_count=0, invalid_block_count=0, unacceptable_finding_count=0, editor_valid_block_rate=1
• Summary artifact: https://homeboy-artifacts-tunnel.dev.chubes.net/eb8b8441-90c4-4663-9a29-9b533e7d1a1b/02b8fd5f-d0b9-4aaf-9776-4994d62247fb-summary.json

AI assistance

• AI assistance: Yes
• Tool(s): GPT-5.5 via OpenCode
• Used for: Integrated candidate PHP transformer fixes, ran local and Lab verification, and drafted this PR description.

[chubes4]

Restaurant fixture follow-up is included in commit d743887.

Verification:

• composer test from php-transformer
• SSI one-fixture Lab run ssi-restaurant-integrated-20260703c
• Lab result: failed_fixture_count=0, editor_invalid_count=0, invalid_block_count=0, unacceptable_finding_count=0, editor_valid_block_rate=1, native_conversion_rate=0.9548
• Summary artifact: https://homeboy-artifacts-tunnel.dev.chubes.net/cb8b9fb4-8570-47f2-9491-17e82ac719f7/22d1fedb-9885-4e58-a6d1-f63b8d49dd62-summary.json

Remaining acceptable findings are mostly inline SVG/core-html preservation, one script runtime island, one SSI diagnostic blind spot, and visual parity mismatch at 16.58% overlap mismatch.

[chubes4]

Added generic business-hours/contact structure follow-up in commit aae02f7.

What changed:

• business-hours day/time rows now convert to editable label/value core/columns instead of flattened paragraphs
• contact-only tel:/mailto: clusters with weak links signals no longer become core/navigation; explicit nav/menu contexts still do
• added focused parity fixtures for both paths

Verification:

• composer test from php-transformer passes (189 parity fixtures)
• SSI one-fixture Lab run ssi-restaurant-label-contact-20260703a
• Lab result: failed_fixture_count=0, editor_invalid_count=0, invalid_block_count=0, unacceptable_finding_count=0, editor_valid_block_rate=1, native_conversion_rate=0.9581
• Summary artifact: https://homeboy-artifacts-tunnel.dev.chubes.net/c1484d4e-a878-45ed-a766-f0605572656f/063be762-04a7-4b54-8671-a55396c2eee6-summary.json

[chubes4]

Ran the next fixture candidate, 8-local-service-business, against the current branch.

Verification:

• SSI one-fixture Lab run ssi-local-service-integrated-20260703a
• Lab result: failed_fixture_count=0, editor_invalid_count=0, invalid_block_count=0, unacceptable_finding_count=0, editor_valid_block_rate=1, native_conversion_rate=0.9005
• Summary artifact: https://homeboy-artifacts-tunnel.dev.chubes.net/c1484d4e-a878-45ed-a766-f0605572656f/063be762-04a7-4b54-8671-a55396c2eee6-summary.json

Next generic targets from this fixture are logo/SVG link decomposition, inline SVG icon handling, and form materialization (form#contact-form) rather than block validity.

[chubes4]

Added two more generic PHP-transformer cycles and verified them through local tests + Lab.

Decorative SVG labels:

• Commit 62f9606 normalizes decorative SVG/icons out of button/logo RichText labels while preserving standalone SVG artwork as core/html.
• Added coverage for logo SVG+text anchors, tel/mail CTA icon labels, and icon-only accessible buttons.
• Local tests: composer test passed with 191 parity fixtures.
• Local-service Lab run ssi-local-service-svg-labels-20260703b: failed_fixture_count=0, editor_invalid_count=0, invalid_block_count=0, editor_valid_block_rate=1, native_conversion_rate=0.9092.
• Summary artifact: https://homeboy-artifacts-tunnel.dev.chubes.net/5104bb8b-534b-471e-a207-f6f18593040c/59497744-d7b8-4f5e-9e0a-13d64e64a46c-summary.json

Form fallback contract:

• Commit 7f45a0f enriches provider-neutral html_form_fallback metadata: form identity/attrs, explicit control order, cleaned labels, submit text, validation/default state, select placeholder options, and adjacent success-panel metadata.
• Block output remains preserved fallback; this gives SSI/downstream materializers a stable form contract without pretending arbitrary forms are native core blocks.
• Local tests: composer test passed with 192 parity fixtures.
• Event/conference Lab run ssi-event-conference-form-contract-20260703a: failed_fixture_count=0, editor_invalid_count=0, invalid_block_count=0, editor_valid_block_rate=1, native_conversion_rate=1.
• Summary artifact: https://homeboy-artifacts-tunnel.dev.chubes.net/summary.json

Remaining generic opportunities from the event fixture: schedule/session patterns, speaker/ticket cards, FAQ accordion-to-native details, and better SVG/icon diagnostics/tokenization.