fix(adapters): drop silent-sentinel row fallbacks across Apple Podcasts, Reddit, and Gitee

[Benjamin-eecs]

Description

Continues the audit-baseline cleanup from #1611 (lesswrong) and #1631 (wikipedia / 36kr / xiaoyuzhou / zhihu), aligned with the direction set by 7164615 (silent-empty-fallback resolutions across Douyin / Jike / WeRead) and ee54eb8 (ignore sentinels in thrown errors).

Replaces silent-sentinel row fallbacks with the empty-string signal so agents can tell apart "field has the literal value Unknown" from "upstream returned no value".

Type of Change

• 🐛 Bug fix
• ✨ New feature
• 🌐 New site adapter
• 📝 Documentation
• ♻️ Refactor
• 🔧 CI / build / tooling

Checklist

• I ran the checks relevant to this PR
• I updated tests or docs if needed
• I included output or screenshots when useful

Fix

Adapter	Field	Pattern
apple-podcasts/search	episodes, genre	?? '-' to ?? ''
reddit/saved	title	|| '-' to || ''
reddit/upvoted	title	|| '-' to || ''
gitee/search	language, description	|| '-' to || ''

All four files audited for downstream sentinel checks (grep -nE "=== ?['\"](Unknown|unknown|-)['\"]"); none reference the swapped values in control flow. This is the audit step that caught the v2ex/me.js regression in #1631 before merge.

Intentionally skipped

• gitee/trending.js:272: downstream project.description !== '-' check drives the mergedDescription fallback. Same control-flow sentinel pattern as v2ex/me.js. Stays on baseline.
• web/read.js (4 entries): '-' lives inside lines.push(...) rendered diagnostic text, not row fields. Empty would render with doubled spaces.
• yollomi/{edit,video}.js (6 entries): file: '-', size: '-', credits: '-' are user-facing status rows. Empty would collapse columns visually.
• zsxq/dynamics.js:31: title: '[${d.action || 'unknown'}]' is a template-literal-rendered title prefix. Empty would render [].

Screenshots / Output

Smoke test on two of the touched commands (read-only, public):

$ opencli apple-podcasts search "lex fridman" --limit 2 -f json
[
  {
    "id": 1434243584,
    "title": "Lex Fridman Podcast",
    "author": "Lex Fridman",
    "episodes": 497,
    "genre": "Technology",
    "url": "https://podcasts.apple.com/us/podcast/lex-fridman-podcast/id1434243584?uo=4"
  },
  {
    "id": 1567129969,
    "title": "Lex Fridman Podcast | 5 minute podcast summaries",
    "author": "5 minute podcast summaries",
    "episodes": 18,
    "genre": "Technology",
    "url": "https://podcasts.apple.com/us/podcast/lex-fridman-podcast-5-minute-podcast-summaries/id1567129969?uo=4"
  }
]

$ opencli gitee search "vue" --limit 2 -f json
[
  {
    "rank": 1,
    "name": "XE/vxe-table",
    "language": "TypeScript",
    "description": "vxe table 支持 vue2, vue3 的表格解决方案",
    "stars": "5160",
    "url": "https://gitee.com/x-extends/vxe-table"
  },
  {
    "rank": 2,
    "name": "有来开源/vue3-element-admin",
    "language": "Vue",
    "description": "🔥Vue3 + Vite 8+ TypeScript + Element-Plus 构建的后台管理前端模板，配套官方 Java 和 Node 后端源码，vue-element-admin 的 Vue3 版本。",
    "stars": "5843",
    "url": "https://gitee.com/youlaiorg/vue3-element-admin"
  }
]

These outputs come from the v1.7.22 published code path; populated rows are byte-identical between the published code and this PR. The empty-signal path only fires when the upstream API returns a null or missing field (trackCount, primaryGenreName, c.data.title, c.data.body, fields.langs, fields.description), which doesn't surface in the public-API samples above.

Test plan

• npm run build: manifest compiles, no path leaks (git diff cli-manifest.json empty)
• npm run check:typed-error-lint: passes (current=167, baseline=167, new=0, resolved=0)
• npm run check:silent-column-drop: passes
• Smoke test: opencli apple-podcasts search and opencli gitee search still return populated rows (populated-row path is byte-identical to this PR; not a direct exercise of the changed fallback).
• Downstream sentinel audit: grep -nE "=== ?['\"](-|unknown|Unknown)['\"]" across the 4 touched files returns zero hits, so the swapped value is never consumed as a control-flow marker.
• reddit/{saved,upvoted} smoke test omitted (requires logged-in reddit session on this machine); the diff is the same || '-' to || '' shape as the audited apple-podcasts / gitee files and downstream-sentinel grep is clean.

[Copilot]

Pull request overview

Continues a series of cleanups replacing silent sentinel row fallbacks ('-') with the empty-string signal so downstream consumers can distinguish a literal - value from an upstream-missing field. Updates the typed-error lint baseline accordingly.

Changes:

• Replace ?? '-' / || '-' with ?? '' / || '' in 4 adapter files (apple-podcasts/search, reddit/saved, reddit/upvoted, gitee/search).
• Remove the corresponding 6 entries from scripts/typed-error-lint-baseline.json.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
clis/apple-podcasts/search.js	Swap '-' sentinel to '' for episodes & genre
clis/reddit/upvoted.js	Swap '-' sentinel to '' for title
clis/reddit/saved.js	Swap '-' sentinel to '' for title
clis/gitee/search.js	Swap '-' sentinel to '' for language & description
scripts/typed-error-lint-baseline.json	Remove the 6 cleared baseline entries

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